Railway Investigation Report R97C0147

The Transportation Safety Board of Canada (TSB) investigated this occurrence for the purpose of advancing transportation safety. It is not the function of the Board to assign fault or determine civil or criminal liability.

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Runaway/Derailment
Canadian Pacific Railway
Train No. 353-946
Laggan Subdivision
Field, British Columbia
02 December 1997

Summary

On 02 December 1997, at approximately 1200 mountain standard time, Canadian Pacific Railway westward train No. 353-946 derailed 66 cars during an uncontrolled high-speed descent on a steep portion of the Laggan Subdivision known as "Field Hill." The three crew members were not injured.

The Board determined that the crew was unable to control the train speed after the train was set in motion on the steep descending grade with a depleted air brake system and a dynamic brake, which can be used to supplement the air brake, that was not engaged. A series of inappropriate train handling decisions resulted in the depletion of the train air brake system. Railway operating procedures did not prohibit the practice of recharging the air brake system while descending Field Hill. The use of a pneumatic control recovery procedure which was different than that required by the railway operating manual prevented the dynamic brake from engaging. The locomotive pneumatic control recovery feature and the Integrated Function Display were not designed with sufficient regard to error tolerance. Further, railway training and supervision did not ensure that the locomotive engineer had an adequate knowledge and understanding of all aspects of the operation of the GE AC 4400 locomotive. The performance of the locomotive engineer may have been affected by fatigue.

Table of Contents

  1. 1.0 Factual Information
    1. 1.1 The Accident
    2. 1.2 Operating Instructions - Field Hill
    3. 1.3 Injuries
    4. 1.4 Particulars of the Track
    5. 1.5 Occurrence Site Information
    6. 1.6 Personnel Information
    7. 1.7 Hours of Work and Rest Requirements
    8. 1.8 Fatigue
    9. 1.9 Train Information
    10. 1.10 Locomotive Equipment and Operation
    11. 1.10.1 GE AC 4400 Integrated Function Display Screens
    12. 1.11 Pneumatic Control Recovery
    13. 1.11.1 Pneumatic Control Recovery Procedures
    14. 1.11.2 Equipment Design Principles
    15. 1.12 Dynamic Brake Operation
    16. 1.13 Air Brakes Operation
    17. 1.14 Running Brake Test
    18. 1.15 Method of Train Control
    19. 1.16 Train and Locomotive Inspections
    20. 1.17 Locomotive Engineer Training
    21. 1.18 Experience and Supervision
    22. 1.19 Transport Canada Requirements
    23. 1.20 Other Information
    24. 1.20.1 Operating Bulletins
    25. 1.20.2 Other Occurrences
    26. 1.21 Weather Information
  2. 2.0 Analysis
    1. 2.1 Introduction
    2. 2.2 Train Operation
    3. 2.3 Pneumatic Control Recovery and Locomotive Control System Design
    4. 2.4 Training and Supervision
    5. 2.5 Fatigue
  3. 3.0 Conclusions
    1. 3.1 Findings
    2. 3.2 Causes
  4. 4.0 Safety Action
    1. 4.1 Action Taken
    2. 4.1.1 Operating Bulletins
    3. 4.1.2 Operations
    4. 4.1.3 Training
    5. 4.1.4 Locomotive Design Changes
    6. 4.1.5 Environmental Response
    7. 4.1.6 Transport Canada
  5. 5.0 Appendices
    1. Appendix A - Sketch of the Track in the Occurrence Area
    2. Appendix B - Glossary

1.0 Factual Information

1.1 The Accident

Canadian Pacific Railway (CPR) train No. 353-946 (train 353), a loaded unit grain train, departed Calgary, Alberta, Mile 0.0 of the Laggan Subdivision at 0652 mountain standard time (MST)(1), travelling westward to Field, British Columbia, Mile 136.6. The train was operated from Calgary to Stephen, Alberta, Mile 123.0, without incident, arriving at approximately 1150. At Stephen, the track begins a 13.5-mile descent of approximately 1,250 vertical feet to Field, Mile 136.6 (see Appendix A).

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Figure 1 - Simplified diagram of main track from Stephen to Partridge

At Mile 125.1, the crew observed an "Advance Clear to Stop" signal indication which means "Proceed, next signal is displaying Clear to Stop, be prepared to stop at second signal." The next signal was at the east switch at Partridge, at Mile 126.8, and the second next signal was at the west switch at Partridge, at Mile 128.7.

The maximum permissible speed between Stephen and Field is 20 mph with a restriction of 15 mph between Mile 125.7 and the east switch at Partridge, Mile 126.8.

At the east station mile sign, Partridge, Mile 125.8, the recorded train speed was 14 mph, with throttle in power and a minimum (seven pounds per square inch (psi)) brake pipe pressure reduction. A CPR special instruction required a supplementary (i.e. additional) brake application at this location. The purpose of this instruction is to encourage the amount of air brake application to be balanced against the grade so that a stop at any location between Mile 125.7 and Field can be made to enable subsequent movement without releasing the brakes. This brake application was not performed (see Section 1.13 for an explanation of the train air brakes operation).

As the train approached the east switch at Partridge, travelling at 25 mph, the crew observed a "Clear to Stop" indication that required them to prepare to stop the train at the next signal, at the west switch at Partridge (Mile 128.7). The train was still accelerating past the east switch in full dynamic braking (DB)(2) with a minimum brake pipe pressure reduction when the locomotive engineer made a full service brake application. The conductor stated that he was aware that the train speed was approximately 10 mph higher than the authorized 15 mph when the train was approaching the east switch, but he did not take any corrective action because he felt that the locomotive engineer had the train under control. Because the train slowed more than anticipated, the locomotive engineer gradually decreased DB application and advanced the throttle to pull the train westward to clear the east switch. However, the full service brake application caused the train to stall at Mile 128.1, with the rear of the train just clear of the east switch, and the head end of the train about 4,000 feet from the west switch. Since the signal at the west switch was not visible from this location, the locomotive engineer decided to move to a point where the crew could observe the signal. The descending grade at this location was 2.2 per cent. The locomotive engineer was aware that an eastward train was approaching the west switch to take the siding at Partridge, but had not yet arrived. He placed the combined controller in dynamic brake and released the train brakes. The speed of the train increased rapidly to 19 mph approaching the west switch. After a series of ineffective service brake applications, starting at 5.6 mph with full DB applied, the locomotive engineer initiated an emergency brake application and stopped the train with the lead locomotive approximately 500 feet east of the signal.

When an emergency brake application occurs, a pneumatic control (PC) switch operates automatically to reduce the locomotive to idle and nullify power and DB, effectively placing the locomotive in neutral. The purpose of this feature is to ensure that the locomotive is not energized while the train brakes are in emergency and before the train has been brought to a stop. A white indicator light on the locomotive Integrated Function Display (IFD) displaying "PCS Open" shows that the PC switch has been activated. The PC switch will not reset until after a 60-second delay has elapsed and then only through a specific locomotive control sequence. When the locomotive engineer initiated the emergency brake application, the 60-second delay was triggered. The 60-second delay is the time required to ensure that brake pipe vent valves on each car of the train have reset and the cars are ready to be recharged.

After the train stopped, and while waiting for the eastward train to clear the west switch, the locomotive engineer and the conductor discussed their options with respect to recovering from the emergency brake application and how they should proceed down the steep grade. They realized that the train air brake system was likely depleted. A trainman trainee was on the locomotive but did not take part in this discussion. The options discussed included whether to apply retainers(3) or hand brakes(4), or to release the train brakes and recharge the air brake system while moving, using DB to control speed. Although they had just used an emergency brake application to stop their train because full DB and supplemental service brake applications could not control the speed, they jointly decided to take the latter option. It was their belief that the two locomotives, equipped with powerful extended-range DB, could control the train speed while the air brake system recharged. They had used this procedure on previous occasions without problems and they did not believe that the weather conditions were likely to degrade train brake response. They also believed that the curves in the track ahead would have a retarding effect on their train. In addition, the conductor had a train line-up list, which led them to conclude that they would not be required to meet any other trains between Partridge and Field, Mile 136.6.

With the train still in an emergency brake application, and after approximately six minutes had elapsed on the IFD, the locomotive engineer moved the throttle/DB handle (combined controller) from idle to the "DB applied" zone. When the signal at the west end of Partridge displayed "Clear," he moved the train automatic brake handle from emergency to release. Although CPR's General Operating Instructions (GOI), which are not equipment-specific, required that the combined controller remain in the idle position, it was a common practice to place the combined controller in the "DB applied" zone before releasing the train brakes when recovering PC on General Motors (GM) locomotives and it did not adversely affect PC recovery or DB operation. However, the locomotive being operated was a General Electric (GE).

The locomotive engineer interpreted a slight increase in engine speed to mean that DB was engaging. He recalled that he had waited for the 60-second countdown indicator light (located in the air brake message window on the IFD screen) to extinguish before releasing the train brakes and that he had interpreted this to mean that the PC had been recovered. He did not recall seeing the white "PCS Open" indicator light illuminated.

After the train brakes were released, the train accelerated to about 16 mph in about 500 feet. At this point, the locomotive engineer began making incremental brake pipe pressure reductions totalling 26 psi, but the train continued to accelerate. The conductor advised the locomotive engineer that he did not think that the DB was working, in part because he could not hear the sounds normally associated with an operating DB system. The locomotive engineer looked at his combined control lever and replied that the locomotive was in full DB. He did not notice that there was no DB effort registering on the yellow DB braking effort bar on the IFD or that the "PCS Open" light was illuminated.

The train entered the east portal of the Upper Spiral Tunnel (Mile 129.0) at about 25 mph and continued to accelerate to approximately 46 mph when the locomotive engineer made an emergency brake application. At about this time, 29 cars separated from the 84-car train, 16 of which derailed inside the Upper Spiral Tunnel while passing through a 10-degree curve. The last 13 cars remained upright on the track behind the 16 derailed cars. The head end of the train continued to accelerate.

The conductor made an emergency radio broadcast to alert anyone in the area of their runaway train. He then spoke to the rail traffic controller (RTC) and advised him that the train was out of control.

The train continued uncontrolled, with the brakes in emergency, over the next five miles, reaching speeds of up to 50 mph. While travelling at about 47 mph through a nine-degree curve at Mile 134.4, the two locomotives separated from the remaining 55 cars, 50 of which derailed. The last five cars remained upright on the track. During this time, the locomotive engineer recovered his DB function, and using DB and the independent locomotive brake, was able to bring the locomotives under control and continue to Field.

1.2 Operating Instructions - Field Hill

The maximum authorized freight train speed on Field Hill for westward trains was 20 mph, with the exception of a 15 mph speed restriction for trains hauling in excess of maximum tonnage (applicable to train 353) for the assigned horsepower for the ascending grade approaching Stephen. CPR Time Table 82 special instructions stated in part:

  • Maximum speed 12 to 15 mph at Stephen, maximum speed 15 mph between Stephen and public crossing Mile 123.9 (and) Maximum speed 15 mph between Mile 125.7 and east siding switch Partridge . . . .

In addition, these instructions stated:

  • If brake release is necessary, a running release must not be attempted unless the train speed allows a full recharge of braking system. A stop must be made to recharge braking system if brakes released under adverse weather conditions.
  • When reapplying train brakes, make an initial brake application. Under adverse weather conditions, train brakes must be reapplied as quickly as practicable after commencing movement to maintain conditioning of equipment. This application must be made before using dynamic brake . . . .
  • A supplementary reduction (2-4 psi) must be made before passing east station mile sign Partridge . . . . Dynamic braking and/or additional supplementary reductions will be used to balance the train through to Field. Stopping at any location between Mile 125.7 and Field should be made to enable subsequent movement without releasing brakes.

1.3 Injuries

The crew members were not injured.

1.4 Particulars of the Track

The portion of the subdivision from Stephen to Field, known as Field Hill, is single main track, with two designated sidings. The average descending grade is 2.2 per cent(5) in the westward direction. There are sharp curves and several tunnels, including two spiral tunnels (see Appendix A).

The track is comprised of 136-pound continuous welded rail, crushed rock ballast, with steel ties in the tunnels and wood ties on open track.

The track is normally inspected a minimum of two times per week. The last track inspection before the derailment was carried out on the morning of the accident. There were no deficiencies noted during this inspection at the two derailment locations.

The track is designed for a maximum operating speed of 20 mph.

1.5 Occurrence Site Information

The 16 derailed cars at the first derailment site completely blocked the Upper Spiral Tunnel. At the second derailment site (Figure 2), cars were scattered down the steep embankment that sloped towards the Kicking Horse River.

About 1,500 feet of track was destroyed in the Upper Spiral Tunnel, and 1,000 feet at the second derailment site. Sixty-four of the 66 derailed grain hopper cars were destroyed. Approximately 10,200 tons of grain was spilled, about 9,000 tons of which was recovered.

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Figure 2 - Overhead view of second derailment location

1.6 Personnel Information

The crew consisted of a conductor, a locomotive engineer and a trainman trainee. The trainee was making his first road trip. The conductor and locomotive engineer met the qualifications for their respective positions and met fitness and rest requirements.

The locomotive engineer's experience consisted of working as a trainman/conductor based in Medicine Hat from 1983 to 1988. In 1988, he entered the locomotive engineers training program, but was unsuccessful in completing the basic training. He returned to work as a conductor, operating mostly on the Laggan Subdivision until re-entering the locomotive engineers program at Calgary in October 1995. He successfully completed the training program and qualified as a locomotive engineer in June 1996. After qualification, he was off duty for five months. When he returned to work, he worked as a spare locomotive engineer when an assignment was available, otherwise he worked as a conductor on the Laggan Subdivision. He had about one year's experience as a spare locomotive engineer.

The locomotive engineer was working as a spare at his home terminal (Calgary), and had a duty window(6) from 1900 to 0700. The night of 30 November 1997, he slept from 2230 to 0700 the next morning. At 2100, 01 December 1997, after having rested for 2.5 hours, he was called to report for duty at 2300 and was off duty at 0300 on 02 December. Local calling practices permitted a locomotive engineer either to work another tour of duty after a "short turn"(7) (provided he met rest and maximum hours of duty requirements) or to book rest. At 0330, 02 December, the locomotive engineer accepted a call for his second tour of duty to commence at 0530 to operate train 353 from Calgary to Field. Since he had been off duty for about 48 hours previous to the short turn, he took a second tour of duty. Had he not taken the assignment, he could have booked rest after the short turn and still retained his position on the spare board on the expiration of his rest. When the accident occurred, the locomotive engineer had slept approximately 2.5 hours in the previous 29 hours.

The conductor had worked the last four years on the Laggan Subdivision. He qualified for the position of conductor in January 1978. His previous experience consisted of working as a yard helper and yard foreman in Alyth Yard for 22 years. The conductor was not trained or qualified as a locomotive engineer.

The conductor had a duty window from 0500 to 1500 and had been off duty about 48 hours before this assignment. He had a good night of sleep on 30 November and he slept about five hours before he received his call at 0330, 02 December 1997, to commence work at 0530 to operate train 353 from Calgary to Field.

1.7 Hours of Work and Rest Requirements

Maximum hours of service requirements are applicable to railway operating employees in any class of train service. These requirements specify that no employee shall be on duty in excess of 18 hours in a 24-hour period; the maximum time on duty in a single tour of duty is 12 hours, and 16 hours in case of work train service or in case of emergency.

Mandatory time off-duty requirements apply only to employees who are called from an employee pool and do not otherwise have a regularly scheduled assignment or to employees who are called into pool service from other classes of train service. Employees covered by these requirements who have been on duty in excess of 10 hours will not be required to go on duty in pool service for at least 8 hours.

The spare board was split into two 12-hour segments, from 0700 to 1859 and 1900 to 0659. Employees on the spare board are required to protect one of these two windows but are not called during the other. The intended purpose of this arrangement was to guarantee employees the opportunity to obtain sufficient rest. Under this arrangement, the locomotive engineer had the right to book 18 hours of personal rest at his home terminal.

1.8 Fatigue

Research has shown that performance on cognitive and mental problem solving, vigilance and communication tasks shows a 30 per cent decrement after 18 hours of wakefulness. After 48 hours, a 60 per cent decrement was indicated. Performance degradation, or impairment, is progressive, becoming worse as time awake increases.(8)

Fatigue can lead to slowed reactions to normal or emergency stimuli. It takes longer to perceive, interpret, understand and react to objects and events. Fatigued operators may take procedural shortcuts that they would not consider when they are alert because they do not recognize an increasing level of risk. People are poor judges of their own alertness or fatigue levels. "Individuals (especially sleepy individuals) do not reliably estimate their alertness and performance."(9)

Fatigue in the railway industry has been managed by a combination of disciplinary action and regulations specifying mandatory off-duty time and maximum on-duty time. As well, collective bargaining agreements cover maximum on-duty time requirements, and locomotives are equipped with automated vigilance devices. In response to a directive from Transport Canada (TC) to develop a plan to reduce the risk of train crew fatigue, Canadian railways and the Brotherhood of Locomotive Engineers (BLE) established a joint labour-management steering committee and, with expert assistance, developed, implemented and tested a comprehensive Alertness Assurance Process outlined in a report entitled CANALERT '95(10).

On 27 April 1997, CPR and the BLE signed a memorandum of understanding (MOU) that implemented duty windows for pool locomotive engineers on the Brooks and Laggan subdivisions.

In April 1997, the locomotive engineer on this assignment had received Canalert Lifestyle Training. This training was offered to all Calgary operating employees working on the Brooks and Laggan subdivisions.

1.9 Train Information

The train was powered by two GE AC 4400 locomotives and consisted of 84 loaded grain hopper cars. It was approximately 5,120 feet in length and weighed about 11,350 tons.

1.10 Locomotive Equipment and Operation

GE AC 4400 locomotives were put in service by CPR in 1995. Before 1995, CPR's fleet mainly comprised GM-manufactured locomotives, primarily the GM SD40-2F and SD40-2 type.

The GE AC 4400 locomotive air brake control is electronic/pneumatic with microcomputer control; the GM SD40-2F and SD40-2 locomotives air brake controls are mechanical/pneumatic.

CPR's SD40-2 and SD40-2F (9000 series) locomotive fleet was equipped with locomotive engineer control stands of three different configurations. The earlier SD40-2 models had a GM Electro-Motive Division (EMD) control stand that used a single throttle lever, or combined controller, to control power and dynamic brake. Later models used an Association of American Railroads (AAR) control stand that had separate control levers for power and dynamic brake operation. The SD40-2F (9000 series) has a control console (desk type) with a combined power/dynamic handle on a master controller similar to that on a GE AC 4400 locomotive (see Figures 3 and 4).

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Figure 3 - GE AC 4400 control console (Note IFD screen in upper left corner)

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Figure 4 - GM SD40-2F control console

1.10.1 GE AC 4400 Integrated Function Display Screens

The GE AC 4400 locomotives, unlike the GM fleet, are equipped with liquid crystal IFD screens that display multiple locomotive and train functions. The IFD integrates many of the locomotive control indicators that were previously displayed on a number of dials and gauges at various locations accessible to the locomotive engineer.

The IFD uses digital and analog displays with a combination of colours, flashing and steady indications for various locomotive functions. The indicator for PC operation is illuminated steady white with the label "PCS Open" in the middle of the light (see Figure 5). The braking effort bar (yellow) and tractive effort bar (green) are shown on the same screen. The IFD was configured in accordance with the AAR Manual of Standards and Recommended Practices for locomotive system integration.

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Figure 5 - Typical illustration of AC 4400 IFD screen immediately before emergency brakes are released. Note the "PCS Open" light illuminated.

Locomotive functions on most GM SD40-2F and SD40-2 locomotives are displayed by lights and gauges at a number of locations within the cab (see Figure 4). The PC light is shown in red on most GM locomotives.

1.11 Pneumatic Control Recovery

1.11.1 Pneumatic Control Recovery Procedures

CPR's General Operating Instructions (GOI) for recovering the PC were the same for GE and GM locomotives. To recover the PC following an emergency brake application, Section 15 stated in part:

  1. Ensure the throttle [combined controller] is in IDLE position;
  2. Place the automatic brake valve handle in EMERGENCY position; and
  3. Wait 60 seconds, then return the automatic brake valve handle to the RELEASE position, pausing briefly in the HANDLE OFF position.

On GM SD40-2F locomotives, the PC will recover when the combined controller is placed anywhere in the DB operating zone, provided the 60-second time delay has elapsed and the automatic brake handle is returned from the EMERGENCY position to the RELEASE position, after pausing briefly in the HANDLE OFF position. The PC indicator light extinguishes and both power and DB are re-established.

On GE AC 4400 locomotives, the PC will not recover with the combined controller in the DB zone; however, the automatic brake will release once the 60-second time delay has elapsed and the automatic brake valve handle is returned from the EMERGENCY position to the RELEASE position, after pausing briefly in the HANDLE OFF position. The "PCS Open" indicator light on the IFD will remain illuminated as a status indication. There is no alarm to indicate that access to power and DB has not been restored. To recover PC, it is then necessary to move the combined controller briefly into DB SET-UP or IDLE.

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Figure 6 - Typical Illustration of AC 4400 IFD screen after emergency brakes are released. Note speed increase and "PCS Open" light still illuminated indicating that control of power and dynamic braking has not been regained.

1.11.2 Equipment Design Principles

It is an accepted principle of design that equipment should be intrinsically safe; i.e., where possible, the design should not allow an error to result in an accident. This principle is known as error tolerance. To do this, an understanding of the causes of error is developed, and the equipment is designed to minimize those causes. Interlocks are often employed to ensure that an action does not occur inadvertently or out of sequence. Furthermore, errors that are made should be visible and reversible; i.e., it should be readily apparent that an error has been made, and it should be clear how to undo that error. Compelling visual or audible alarms are employed to draw the attention of the operator to the exact nature of the error. Finally, administrative controls, such as rules, regulations and general operating instructions, can be used to reduce the likelihood of error in situations where the design does not alert the operator to an error.

Mode errors develop in situations where a control has more than one function associated with it. A mode error is said to have occurred when an operator's knowledge and understanding of the status of the system is erroneous. The resultant problems are typically relatively difficult to manage because of the lack of awareness of the relationship between the problem and the mode state.

1.12 Dynamic Brake Operation

The DB system is designed to be used as a supplementary braking system, including but not limited to control train speed on long descending grades. Because the braking force is concentrated at the locomotives, DB must be gradually applied and released to regulate train slack. It can be used alone or in conjunction with the train air brakes and operates by electrically converting the traction motors of a moving locomotive into electric generators which act to retard the driving axles of the locomotives to supply a retarding force. The energy generated is converted into heat through resistors known as DB grids. While in DB, it is common for engine RPM to increase above idle, to power blowers that assist in cooling the DB grids.

There are two types of dynamic brakes, the standard and the extended range. The extended-range DB develops its maximum retarding force between 6 mph and 23 mph, while the standard DB is largely ineffective below 10 mph and develops its maximum retarding force at 23 mph. Once the maximum DB is reached, the retarding force decreases gradually as the speed increases.

Most GM locomotives in use on CPR are equipped with a standard DB whereas the GE AC 4400 locomotives have the extended-range DB.

A review of the performance of the two GE AC 4400 locomotives by the locomotive manufacturer, given the weight of the train and the physical characteristics of the track, revealed the following:

  • two GE AC 4400 locomotives can generate a maximum of 156,000 pounds/feet of DB force;
  • by comparing the calculated versus the observed acceleration rates, it appears that the train air brakes were providing approximately 185,000 pounds/feet of braking force; and
  • even if maximum DB force was available, the combined braking force of DB brake and air brake would have been less than that required to control the train at maximum track speed.

1.13 Air Brakes Operation

The air brake system is the primary means of controlling speed and stopping a train. Every car is equipped with an auxiliary and emergency air reservoir. The auxiliary reservoir provides stored air for normal brake applications while the emergency reservoir provides additional air for emergency braking. Both reservoirs are connected through control valves and recharging is directed through the brake pipe from the locomotives.

Control valves on individual cars and locomotives respond to changes in brake pipe pressure. A reduction in brake pipe pressure causes the control valves to direct air from the auxiliary air reservoirs to the brake cylinders which apply the train brakes. The level of braking is directly proportional to the amount of reduction of brake pipe pressure through the automatic brake valve.

In the event of a rapid reduction in brake pipe pressure, either through a breech in the brake pipe or an operator-initiated opening of an emergency valve, the control valves direct air from both the auxiliary and emergency reservoirs to the brake cylinders. The emergency reservoirs are slightly larger than the auxiliary reservoirs. This additional volume increases brake cylinder pressure during an emergency brake application.

When an emergency brake application is released, the control valve on each car connects the auxiliary reservoir and brake cylinder air to the brake pipe, assisting in quick build up of brake pipe pressure. In this condition, with the general state of charge of the individual brake system on each car much lower than is normal, air brakes will release at a significantly lower brake pipe pressure. The required practice when reapplying the air brake shortly after a release would be to reduce the brake pipe pressure 6 to 7 psi below the rear-end brake pipe pressure. The locomotive engineer did not adhere to this practice. He recalled that the rear-end brake pipe pressure was 50 psi before he released the emergency brake at the west end of Partridge.

The GE Operating Manual for CPR AC 4400 Locomotives states:

  • WARNING : STOPPING HAZARD. Under no circumstances should a train be permitted to continue in operation if the brake pipe pressure falls below 45 psi. If this situation occurs, the train must be stopped, and the brake pipe recharged to the railroad particular setting. Failure to comply with this warning may result in the inability to control or stop the train.

CPR Operating Manual, Section 16, Item 3.5 (Use of Automatic Brake Valve) states:

  • Should locomotive brake pipe pressure be reduced below 48 psi during service brake application, the train must be stopped and brake pipe system recharged.

CPR did not have specific instructions for Field Hill requiring that the trains which have had an emergency brake application remained stopped until the brake system had been recharged.

1.14 Running Brake Test

CPR Prairie District Time Table 82 Special Instruction Item 1 required that a "running brake test" (a test of brakes made on a moving train to ascertain that the brakes are operating) be made between Mile 112.0 and Mile 113.0. This test was to ensure that the brakes were operating properly before reaching the steep descending grade west of Stephen. It was not performed by the train crew. The locomotive engineer recalled that he had successfully used the train brake numerous times before that point and therefore he did not think that a test was necessary.

1.15 Method of Train Control

The method of train control on the Laggan Subdivision is the Centralized Traffic Control System (CTC), authorized by the Canadian Rail Operating Rules (CROR), and supervised by an RTC in Calgary.

1.16 Train and Locomotive Inspections

The two locomotives had been inspected at Calgary with no problems noted. However, the incoming operating crew members advised the outgoing crew members of an intermittent flashing light on the display of the Train Information and Braking System (TIBS) on the lead locomotive, but they did not consider this problematic and that the DB cut-out switch seal was broken on the trailing locomotive, but the switch was on. When tested, the DB functioned normally. A pull-by inspection of the train was performed on departure and no problems were noted.

1.17 Locomotive Engineer Training

CPR's locomotive engineer training consisted of classroom training, familiarization trips, and 16 weeks of on-the-job training. Additional time was given for the on-the-job training, if necessary.

The training program covered the following subjects:

  • safety and accident prevention;
  • locomotive operation and troubleshooting;
  • train and locomotive air brake systems;
  • safety and general rules;
  • operating rules;
  • air brake rules;
  • remote locomotive operation; and
  • train handling instructions, fuel conservation and track/train dynamics.

Following the classroom instruction, the trainees were assigned to work with a certified locomotive engineer instructor for familiarization training. This familiarization training consisted of riding locomotives and observing locomotive and train operations from a locomotive engineer's point of view. Upon completion of familiarization training, trainees returned to the classroom for a review of rules, mechanical and air brake training. Written examinations were administered approximately 16 weeks after the initial training began and are intended to test students on long-term retention during the learning process. A passing grade of not less than 90 per cent for rules examinations and not less than 85 per cent for all mechanical examinations was required by CPR.

The final 16 weeks of on-the-job training consisted of the trainee being assigned to various certified locomotive engineer instructors so experience could be obtained on different types of equipment and train movements. It was expected that this on-the-job training would expose the trainee to a variety of train handling situations and techniques. A trained locomotive engineer must be prepared to operate a variety of locomotives in road, switcher and yard service. However, railway companies in Canada do not issue any type of certification card that indicates whether the locomotive engineer has received training and demonstrated proficiency on a particular type of locomotive.

When CPR introduced the GE AC 4400 locomotives in 1995, certified locomotive engineers were given a four-hour transition course outlining the operating procedures for these locomotives. After the transition training in 1995, GE AC 4400 locomotive training was included in the regular locomotive engineer training program. This portion of the training was approximately three hours in duration. The training covered the operating characteristics of the DB function and the recovery procedures after emergency and penalty brake applications. This training did not specifically identify the circumstances under which an emergency brake application could be released without recovering the PC on GE locomotives, as this feature was not generally known to railway instructors before the occurrence. The locomotive manufacturer indicated that the locomotives were built to design specifications set by the railway, including those for the PC recovery feature. CPR advises that it never issued specifications to GE on how the PC recovery system was to work and that this was GE's design which CPR accepted without the knowledge that it worked differently than other locomotives. However, the PC recovery system on the GE locomotive functioned as prescribed in CPR's GOI (quoted in part in section 1.11.1 of this report), while most other locomotives did not require strict adherence to the approved method of PC recovery. According to the locomotive engineer, during classroom training, he received no structured hands-on training on the use of the IFD and was given five minutes to familiarize himself on a desktop simulation of the IFD.

The locomotive engineer completed 127 job-training trips, 11 of which involved GE AC 4400 locomotives and included 3 trips westward and 5 trips eastward on the Laggan Subdivision. He completed an additional 28 trips westward and 20 trips eastward on the Laggan Subdivision with other types of locomotives. Performance evaluation reports submitted by locomotive engineer trainers ranged from "as required" to "excellent."

1.18 Experience and Supervision

During the six months before this occurrence, the locomotive engineer had operated 41 trains on the Laggan Subdivision, 25 of which were westward movements. Only one train had been powered by GE AC 4400 locomotives. All of the other trains were equipped with GM locomotives.

CPR has a policy that requires that the performance of locomotive engineers, conductors, yard masters, and RTCs be evaluated at least once per year (Conducting and Reporting Efficiency Tests, Form 200). The proficiency tests are performed by superintendents, operating officers, engineering officers, and supervisors from the engineering and operating departments. However, at no time after he was certified as a locomotive engineer in June 1996 had the performance of this locomotive engineer been evaluated, nor was there an efficiency performance test(11) made by supervisors.

1.19 Transport Canada Requirements

TC requires that a locomotive engineer obtain a railway company-determined overall post-training mark of at least 80 per cent in the following subjects in order for the employee to maintain status as a locomotive engineer or conductor and that such tests be taken at intervals not exceeding three years:

  • Canadian Rail Operating Rules;
  • railway radio regulations;
  • dangerous goods handling;
  • train marshalling;
  • air brake systems and tests;
  • locomotive operation;
  • train handling; and
  • freight car and train inspection.

Candidates must also demonstrate competency in performing practical train operating duties to railway instructors and examiners.

TC inspectors ride trains and audit railway training programs for compliance to the qualification standards. Although the qualification requirements specify broad categories for railway operating employee qualification, they do not prescribe the specific nature of training required. These are matters considered by TC to be the responsibility of the railway company.

1.20 Other Information

1.20.1 Operating Bulletins

On 01 December 1997, the day before the accident, the railway had issued an Operating Bulletin identifying a potential problem with GE AC 4400 locomotives on Locotrol IV-equipped trains. The bulletin indicated that the nature of the problem had not been conclusively determined, but that, during attempted PC recovery, train brakes had begun to release before actual PC recovery. Due to the time when the crew came on duty and the distribution of the bulletin, it was not available to the crew of train 353 at the location where they came on duty.

1.20.2 Other Occurrences

On 13 April 1996, a freight train handling 112 cars travelled uncontrolled between Mile 128.9 (Upper Spiral Tunnel) and Field, reaching a speed of 34 mph. There was no derailment and no one was injured as a result of this incident (TSB report No. R96C0086).

On 02 January 1998, a similar incident occurred on Field Hill when a 112-car freight train travelled uncontrolled between Mile 128.9 and Field, reaching a speed of 42 mph. There was no derailment and no one was injured as a result of this incident (TSB occurrence No. R98C0001).

1.21 Weather Information

The temperature was minus 13 degrees Celsius. The skies were clear. The wind was calm.

2.0 Analysis

2.1 Introduction

This occurrence followed the uncontrolled train movement of 13 April 1996 investigated by the TSB. Subsequent to this occurrence, an uncontrolled train movement occurred at this location on 02 January 1998.

In view of the continuing difficulty associated with operating trains safely down Field Hill, this analysis will focus on the following issues:

  • train operation;
  • PC recovery and locomotive control system design;
  • training and supervision; and
  • fatigue.

2.2 Train Operation

Railway operating procedures provided some guidance for train operation from Stephen to Field, specifically on the manner of braking to be used in preparation for and during the descent of Field Hill. By not making the recommended supplementary brake application at the east station mile sign for Partridge, the locomotive engineer allowed the train to accelerate above the required speed. This necessitated the use of excessive amounts of air brake to gain control of the train, led to the depletion of the service brake air supply and ultimately resulted in an undesired stop or stall of the train. The decision to release the brakes from this location was questionable. Since the opposing train had not yet cleared the siding, another stop at the west end of Partridge was foreseeable. Whereas by waiting until the opposing train had cleared the siding, it is probable that train 353 would have averted the requirement for that stop.

When the train brakes were released from the full service application, the combined controller was in the "DB applied" zone. This did not adversely affect DB function because the PC was not involved. The locomotive engineer then made a series of ineffective incremental brake applications. The required practice when re-applying the brake shortly after a release is to first reduce brake pipe pressure at least 6 to 7 psi below the brake pipe pressure reading at the rear end of the train. This was not done. When it became apparent that the train could not be controlled in full DB with the automatic brake valve in the fully applied position, the locomotive engineer initiated an emergency brake application, which brought the train to a stop at the west end of Partridge. These events depleted the air in the air brake system. The state of charge of the air brake system and the inability to stop at the west end of Partridge, with a full service brake application and full dynamic brake, should have given the locomotive engineer another reference for the effectiveness of the DB on this train.

In order to fully recharge the train air brake system, it would have been necessary to either apply hand brakes or retainers. The crew decided not to apply hand brakes or retainers because they believed it would be safe to begin descending the remainder of Field Hill controlling train speed with DB while the air brake system recharged. However, the locomotive engineer then followed an unapproved procedure of PC recovery that, while functionally acceptable for GM locomotives, resulted in the release of the train brakes without regaining DB on GE locomotives. Once the air brakes were released, the locomotive engineer presumed that DB was functioning and did not observe the "PCS Open" light or the DB braking effort bar on the IFD. By the time he realized that DB was not functioning, the train had accelerated to 16 mph before reapplying the air brakes. He continued to make a series of ineffective brake applications until the train accelerated to the point where its air brake system could not overcome the train's inertia on the steep mountain grade. When the speed of the train increased to a point where the design speed of the track was exceeded, the train derailed.

Applying hand brakes to hold the train stationary while recharging the brake system, or using retainers to retain brake cylinder pressure on selected cars after the train brakes were released, would have ensured that train 353 safely descended the remainder of the hill, but would have caused significant delay to the train. Without a procedure requiring the use of hand brakes or retainers, the locomotive engineer and the conductor relied on their past experiences. Since it was not known that the air brakes could be released without regaining effective DB function on these GE locomotives, the locomotive engineer did not anticipate problems. If retainers were used and DB were fully applied, it is still possible that additional air brakes may have been required to control the speed of the train. This was not the required PC recovery procedure, but it was the common practice on GM locomotives.

The absence of explicit operating instructions requiring that the train brakes be fully charged before descending Field Hill contributed to the crew's decision to descend the hill with the air brake system depleted. This, in conjunction with the locomotive engineer not knowing that a non-standard PC recovery method would not work on this particular model of locomotive (GE AC 4400) and the application of a non-standard PC recovery procedure, led to the uncontrolled movement of the train.

2.3 Pneumatic Control Recovery and Locomotive Control System Design

The locomotive engineer did not notice the "PCS Open" indication on the IFD screen. While the exact reason for this could not be ascertained, the indicator (small white continuous light) was not a sufficiently compelling display to the locomotive engineer to stimulate the desired reaction. In contrast, the "PCS Open" light on most GM locomotives is red, which is a more compelling warning that the PC switch is open. There were, however, several cues that may have falsely reinforced the locomotive engineer's belief that the PC switch had reset:

  • the extinguishing of the time-out message in the air brake message window on the IFD;
  • the emergency brake application release;
  • a slight increase in engine RPM after DB was selected; and
  • the sound of locomotive compressors.

In this circumstance, the locomotive engineer was confronted with an integrated display screen with more than 20 display operating parameters with which he had little experience, as compared to the more familiar conventional analogue dials and indicator lights. The locomotive engineer's lack of reference to the critical indicators on the IFD illustrates his inexperience with these types of displays.

The control manipulation sequencing for PC recovery procedure employed by the locomotive engineer was effective on GM locomotives and commonly used. However, it was not the approved procedure for either the GM or GE AC 4400 locomotives. CPR supervisors were aware that a procedure different from that outlined in their operating instructions was in common practice, but were not aware that this procedure, when applied to GE locomotives, would release the air brakes but not recover PC and not restore power and DB. While the use of the specified GOI procedure would have led to PC recovery, this aspect of the locomotive control system design is not error-tolerant. Ideally, all locomotive systems should be in the same manner and have appropriate countermeasures that can be taken so that a control error does not result in a potentially unsafe condition; i.e., release of the brakes without PC recovery.

The design of the locomotive control system allowed the locomotive engineer to release the train brakes without immediate access to DB and power. This resulted in a mode error, in which the locomotive engineer did not have an accurate appreciation of the operating state of the locomotive. This made the task of assessing the problem and choosing an appropriate response relatively difficult. A more error-tolerant design, including a more compelling display, could have precluded the release of the train brakes without PC recovery and thereby averted this mode error.

2.4 Training and Supervision

The locomotive engineer's lack of familiarity with the differences between the IFD screen used on GE locomotives and the conventional instrumentation used on GM locomotives contributed to his inability to recognize that the DB was not engaged. Although he did not know that the automatic brake would release before PC recovery on this locomotive, a more thorough knowledge of the IFD may have led him to wait until the "PCS Open" light extinguished before releasing the automatic brake or to notice the absence the yellow DB amperage bar. The training offered to locomotive engineers did not ensure that they had sufficient understanding and proficiency in the use of the IFD and in the ramifications of deviating from the required PC recovery procedures.

The railway company introduced new technology in the form of the GE AC 4400 locomotives which interacted with common local practice in an unanticipated and undesirable fashion. Although the crew members of train 353 did not follow required procedures, it was critical for them to understand the consequences of deviating from these procedures. While the locomotives were built to design specifications endorsed by the railway, the railway accepted the manufacturer's specifications relating to the PC recovery. Locomotive engineer trainers were unaware that the PC recovery characteristics of the new locomotives, as described in the GOI, would not allow the unapproved PC recovery method commonly used on GM locomotives to work, and therefore, they were unable to apprise locomotive engineers of those characteristics. Certification, post-certification follow-up and performance monitoring did not determine that there were gaps in locomotive engineer knowledge and understanding of GE AC 4400 locomotives. Without a minimum standard to authorize and evaluate the level of locomotive engineer qualifications, particularly outlining proficiency on locomotive type, locomotive engineers can continue to be placed in a position of operating a locomotive for which they are not fully qualified to operate.

2.5 Fatigue

When the locomotive engineer chose not to book rest at the completion of his short turn, he placed himself in a position of potentially being on duty for 18 hours in a 24-hour period. Had he booked rest, he would have positioned himself at the bottom of the list and lost the remuneration for the trip to Field. Although the locomotive engineer's work/rest cycle was within company and government requirements and he had taken the lifestyle training on recommended sleep patterns, he had only had 2.5 hours of rest in the previous 29 hours before this accident occurred. The system of remuneration and scheduling for locomotive engineers may increase the risk that employees will work in a fatigued condition to avoid financial loss. While rest and maximum duty time requirements exist, the current approach does not integrate elements such as remuneration and scheduling into a comprehensive approach to fatigue management.

The locomotive engineer's ability to make critical operating decisions and assess the consequences of those decisions may have been impaired by fatigue. He made a number of decisions that were inconsistent with safe train handling procedures, such as not making the required subsequent brake pipe reduction at Mile 125.8, and choosing to control train speed with DB while recharging the train brakes when he had previously demonstrated that the DB was insufficient to control train speed. The effects of fatigue on his performance may have been exacerbated by his lack of familiarity with the GE locomotive.

3.0 Conclusions

3.1 Findings

  1. The locomotive engineer made a series of operating decisions that required him to make full service brake application followed by an emergency brake application on a steep descending grade, thereby depleting the air brake system on the train.
  2. In the absence of railway operating instructions requiring the specific use of hand brakes or retainers on Field Hill, it was within approved procedures to attempt to recharge the air brake system while descending the hill.
  3. CPR did not have specific instructions for Field Hill requiring that the trains which have had an emergency brake application remain stopped until the brake system has been recharged.
  4. The performance of the locomotive engineer may have been affected by fatigue which would have impaired his ability to make critical operating decisions.
  5. It was not generally known by railway operations supervisors or employees that the train brakes would release without access to dynamic braking (DB) or power when the combined controller was placed in DB mode before the reset of the pneumatic control (PC) switch on GE AC 4400 locomotives after an emergency brake application.
  6. The control system for PC recovery was built to a GE specification that was accepted by CPR without knowing the consequences if an unapproved PC recovery procedure were used.
  7. The locomotive engineer's processing of information from the Integrated Function Display (IFD) screen (on the GE AC 4400 locomotive), resulted in the train air brakes being released before the recovery of DB. In addition, these systems were not designed to make it readily apparent to the locomotive engineer that an error had been made nor did they indicate clearly how to reverse the error.
  8. The training provided to locomotive engineers did not ensure that they had sufficient understanding and proficiency in the use of the IFD screen on GE AC 4400 locomotives or other system differences between GM and GE locomotives. Without a minimum standard that will authorize or evaluate the level of locomotive engineer qualifications, particularly outlining the proficiency on locomotive type, the ability to accurately assess locomotive engineer proficiency is limited.

3.2 Causes

The crew was unable to control the train speed after the train was set in motion on the steep descending grade with a depleted air brake system and a dynamic brake, which can be used to supplement the air brake, that was not engaged. A series of inappropriate train handling decisions resulted in the depletion of the train air brake system. Railway operating procedures did not prohibit the practice of recharging the air brake system while descending Field Hill. The use of a pneumatic control recovery procedure which was different than that required by the railway operating manual prevented the dynamic brake from engaging. The locomotive pneumatic control recovery feature and the Integrated Function Display were not designed with sufficient regard to error tolerance. Further, railway training and supervision did not ensure that the locomotive engineer had an adequate knowledge and understanding of all aspects of the operation of the GE AC 4400 locomotive. The performance of the locomotive engineer may have been affected by fatigue.

4.0 Safety Action

4.1 Action Taken

4.1.1 Operating Bulletins

On 05 December 1997, the railway issued an Operating Bulletin concerning emergency pneumatic control (PC) recovery procedures on all GE AC 4400 locomotives. This bulletin stressed adherence to the existing General Operating Instructions (GOI), and indicated that automatic brake release was possible without PC recovery if the throttle/dynamic braking (DB) handle was not placed in idle before releasing the train brakes.

In addition, on 05 December 1997, the railway issued Operating Bulletin No. 188, which states:

  • Effective immediately please add the following new instruction to GOI Section 15.
  • 14.3 Emergency Brake Recovery Procedure - Retainers/Handbrakes
    • IF - a train is standing on a grade which is greater than 1.5%
      AND
      - it is the second emergency brake application on that grade
      AND
      - the locomotive brakes are not sufficient to prevent train movement.
      THEN
      - do NOT attempt to recover the emergency PC until hand brakes or retaining valves are set as follows:
      1. set retaining valves to the high pressure (HP) position on at least 50 percent of the loaded cars;

        OR
      2. apply hand brakes on at least 50 percent of the cars. The hand brakes must not be released until after the train air brake system is fully recharged.
  • NOTE: This does not alter the requirement to apply hand brakes or retainers when conditions are such that their use is considered necessary after one emergency.

4.1.2 Operations

On 01 December 1997, the railway had issued an Operating Bulletin identifying a potential problem with GE AC 4400 locomotives on Locotrol IV-equipped trains. The bulletin indicated that the nature of the problem had not been conclusively determined, but that, during attempted PC recovery, train brakes had begun to release before actual PC recovery.

Following resumption of operations, on 10 December 1997, CPR committed operating officers to accompany crews on every train operating westward on the Field Hill for a period of 11 days to monitor operating procedures and compliance with operating instructions on Field Hill.

CPR issued bulletins on 05 December 1997, addressing emergency brake recovery procedures on Field Hill, and warned crews concerning the PC recovery on all GE AC 4400 locomotives. PC recovery warning labels have been applied to the locomotives.

Subsequent to the 02 January 1998 incident, on 05 January 1998, seven operating officers and eight experienced locomotive engineers were assigned riding trains, between Lake Louise and Field, to monitor train crew performance pertaining to the issues addressed in the new bulletins, revised speed restrictions on Field Hill, and the proper method of using the train braking systems on the steep grade. CPR issued two bulletins which addressed train operations in severe weather conditions and snow accumulation above top of rail, and another which mandated an emergency brake application if train speed reached 24 mph when descending Field Hill.

New train handling procedures were developed for Field Hill and are now included in the Prairie District Time Table footnotes for the Laggan Subdivision, effective 01 July 1998. Included in this bulletined information are instructions mandating a fully charged train brake system when descending Field Hill, the use of retainers and/or hand brakes, specific instructions when stop and go is required on Field Hill and substantial reductions in permitted speed.

On 15 May 1998, CPR's technical training support group produced a Field Hill Job Aid for crews operating on the Laggan Subdivision. This pamphlet contains event-specific instructions for moving from a stop after releasing the train automatic brake, emergency PC recovery, and communication loss with train in emergency for both Locotrol II and Locotrol IV systems on GM and GE locomotives. Application of similar instructions to other CPR trackage on heavy grades was examined on a case-by-case basis.

Similar action was taken by the British Columbia District with crews operating out of Revelstoke, both for Field Hill and Albert Canyon. The following operating bulletins were issued and are continued to be carried in the district's monthly operating bulletin:

BCO-184 97-12-01 Emergency PC Recovery Locotrol IV
     
BCO-187 97-12-05 Retainers/Handbrakes after emergency
     
BCO-188 97-12-05 Emergency PC Recovery GE AC4400
     
BCO-204 97-12-30 Emergency Recovery/Retainers/Handbrakes
     
BCO-174 98-06-30 Emergency Recovery Procedure on grades 1.5 % or greater

Revelstoke managers conducted a safety blitz from 05 December to 15 December, during which time these bulletins were personally given to each running trade employee along with the company's safety message on the subject. These were discussed at length with all employees. Trains were again ridden around the clock from 19 January to 22 January with each train required to stop at Albert Canyon on a 2.4 per cent descending grade with the train stopped in emergency and recovered properly.

There was a round-the-clock safety blitz on the Cranbrook Subdivision starting 05 December and running for five days followed by a blitz from 13 January to 15 January. All of the above bulletins were issued and discussed with employees operating on the Fording Subdivision, along with pertinent sections of the GOI. The long-term response is to do a safety blitz at regular intervals on the Fording Subdivision while highlighting issues related to the Laggan Subdivision derailment.

4.1.3 Training

CPR has initiated changes to its training program for both conductors and locomotive engineers. A special "Field Hill Module," to present to conductor candidates who are working out of Calgary, has been developed to cover the procedures to be used in applying retainers and hand brakes when operating trains on Field Hill. The on-the-job training portion of the module will provide a total of eight trips on Field Hill with an instructor.

The procedure for requalifying locomotive engineers for Field Hill has been changed. Locomotive engineers are being requalified in the following categories: ascending and descending the steep grade of Field Hill, performing stop and go functions at Partridge, and full service stop and release at Cathedral, while maintaining proper control of the train.

A Field Hill specific check list has been developed to be used in conjunction with the Locomotive Engineer Evaluation Form (Form 912) to reflect special requirements when evaluating the performance of locomotive engineers on Field Hill.>

A GE AC 4400 full-cab simulator is currently in place at CPR's training centre. It is equipped with functional IFD and integrated cab electronics (ICE) screens and with a desktop control stand. This is in addition to the existing AAR 105 locomotive simulator.

CPR has developed a Crew Resource Management training module and a pilot presentation was delivered in August 1999. It was designed to train employees in communication skills, situational awareness, and human factors. The training will be included in all new locomotive engineer and conductor programs, including re-certification training. The module was also designed to be cross-functional and flexible enough to be used by mechanical services, engineering services, and others within the company. Transport Canada officials will be invited to participate in the training program.

4.1.4 Locomotive Design Changes

CPR has revised the DB specification for locomotives. All future purchases of locomotives of any model will be equipped with a "DB holding" feature. When an emergency application occurs, a locomotive equipped with DB holding maintains the ability to generate DB effort, even when the "PCS Open" alarm appears.

CPR is also modifying all of its GE AC locomotives so that the "PCS Open" alarm is displayed in red on the IFD screen.

4.1.5 Environmental Response

CPR used vacuums, augers, excavators and hand sweeping to recover the majority of the spilled grain. Subsequently, CPR employed the use of an electric fence to deter animals from acclimatising themselves to this unnatural food source. A part-time park warden was also employed to assist with monitoring the site.

4.1.6 Transport Canada

Transport Canada conducted a series of inspections and testing of air brakes and retainer valves on targeted railway rolling stock to determine the level of condition and maintenance. Some concerns were raised as a result of the tests, particularly with the performance of some truck-mounted brakes, retainer valves, and with testing of air brake components on repair tracks and in shops. As a result, CPR has issued a General Bulletin Order to train crews on the use of retainer valves when operating between Stephen and Field. Furthermore, CPR has issued a Mechanical Bulletin to all shops and repair tracks to test and ensure proper maintenance of the retainer valves. CPR has advised that it would continue to look at this on a long-term basis.

Transport Canada advised that, on the issue of fatigue, the Railway Association of Canada has established a Working Group, consisting of railway management and union (UTU/BLE) officials, to formulate new rules concerning hours of work and rest requirements for railway operating employees in the workplace, i.e., both yard and road services. This proposed industry-wide rule has been progressed to the consultation process with the affected parties at the end of 1999.

This report concludes the Transportation Safety Board's investigation into this occurrence. Consequently, the Board, consisting of Chairperson Benoît Bouchard, and members Jonathan Seymour, Charles Simpson, W.A. Tadros and Henry Wright, authorized the release of this report on 10 December 1999.

Appendix A - Sketch of the Track in the Occurrence Area

ALT

Appendix B - Glossary

AAR   Association of American Railroads
BLE   Brotherhood of Locomotive Engineers
CPR   Canadian Pacific Railway
CROR   Canadian Rail Operating Rules
CTC   Centralized Traffic Control System
DB   dynamic braking
EMD   Electro-Motive Division
GE   General Electric
GM   General Motors
GOI   General Operating Instructions
HP   high pressure
ICE   integrated cab electronics
IFD   Integrated Function Display
ICE   integrated cab electronics
MOU   memorandum of understanding
mph   mile(s) per hour
MST   mountain standard time
PC   pneumatic control
psi   pound(s) per square inch
RPM   revolutions per minute
RTC   rail traffic controller
TC   Transport Canada
TIBS   Train Information and Braking System
TSB   Transportation Safety Board of Canada
UTC   Coordinated Universal Time
UTU   United Transportation Union

1. All times are MST (Coordinated Universal Time (UTC) minus seven hours) unless otherwise stated.

2. The dynamic brake is a locomotive braking system that uses the locomotive traction motors to retard the rotation of the locomotive drive axles and can be used alone or in conjunction with the train air brake system.

3. Retainer valve - A valve on all freight cars through which brake cylinder pressure is exhausted. The valve can be manually set to retain brake cylinder pressure or restrict its rate of exhaust.

4. Hand brake - a hand-operated brake system on each rail car capable of creating the equivalent braking force of the air brake system.

5. A grade of 1.8 per cent and greater is considered to be a mountain grade.

6. A duty window is a designated work period within 24 hours when the employee must be available to accept work assignments. Duty windows were instituted as a fatigue countermeasure subsequent to the CANALERT '95 study.

7. A short turn is usually in proximity to the home terminal, is shorter in duration than a minimum day (8 hours or 100 miles) and allows the locomotive engineer to retain his or her position on the spare board.

8. R.G. Angus et al., "Sustained Operations Study: From the Field to the Laboratory," Why We Nap: Evolution, Chronobiology and Functions of Polyphasic and Ultrashort Sleep, ed. C. Stampi (Boston: 1992), pp. 217-241.

9. M. Rosekind et al., Crew Factors in Flight Operations X: Alertness Management in Flight Operations, NASA Technical Memorandum DOT/FAA/RD-93/18, NASA Ames Research Center, 1994.

10. CANALERT '95 Phase II, Circadian Technologies Inc., May 1996.

11. Efficiency performance tests are random evaluations of an employee while on the job.