News release

Lac-Mégantic update: Immediate safety issues identified

Lac-Mégantic, Quebec, 19 July 2013—The Transportation Safety Board of Canada (TSB) has issued two urgent Safety Advisory Letters to Transport Canada (TC) in relation to its ongoing investigation into the Montreal, Maine & Atlantic Railway (MMA) train derailment on 6 July 2013 in Lac-Mégantic, Quebec.

Safety Advisory Letters

The first issue pertains to the securement of equipment and trains left unattended. The TSB investigation has determined that the braking force applied was insufficient to hold the train on the 1.2% descending slope, and is asking TC to review the Canadian Rail Operating Rules (CROR) 112 [Securing Equipment] and the related railway special instructions to ensure that equipment and trains left unattended are properly secured in order to prevent unintended movements.

RAIL SAFETY ADVISORY LETTER – 09/13 - Securement of Equipment and Trains Left Unattended

The second issue concerns the securement of trains carrying dangerous goods. Given the importance of the safe movement of dangerous goods and the vulnerability of unattended equipment, the TSB is asking TC to review all railway operating procedures to ensure that trains carrying dangerous goods are not left unattended on a main track.

RAIL SAFETY ADVISORY LETTER – 08/13 - Securement of Unattended Locomotives

Work to date

The TSB continues to make progress in a number of parallel streams in the field phase of its investigation. Numerous investigators and other experts are working on site, at the headquarters in Gatineau, or at our engineering laboratory in Ottawa. This investigation remains the top priority for the TSB.

Locomotive event recorder

As previously mentioned, the TSB has downloaded key information from the locomotive event recorder and the sense and braking unit and the work is ongoing.


TSB investigators inspected the tracks, and conducted a site survey, photogrammetry and videography to determine track grade and position, and this information will be used for future calculations and computer modelling.

Tank cars

Investigators have conducted mechanical inspections and photographed 22 tank cars to date to document accident damage. Sample pieces of the tank cars are also being sent to the TSB laboratory in Ottawa for further metallurgical analysis.

3D imaging

The TSB is conducting 3D laser imaging with the assistance of the U.S. National Transportation Safety Board (NTSB) to record three-dimensional data of the accident scene and different pieces of the wreckage. The scanner will be used to create full-color still images and assist in computer modelling.

Product sampling

Samples were taken of the products inside selected tank cars to determine their exact properties. Shipping documents and train journals are being reviewed to ensure the information is accurate.


Investigators have conducted numerous interviews. They have interviewed the locomotive engineer and other employees from MMA, first responders such as firefighters, and officials from TC, among others. This important work continues, but it is important to note that under the Canadian Transportation Accident Investigation and Safety Board Act, all interviews are protected information and will not be publicly released.

Regulatory oversight

We have collected data from Transport Canada in order to examine regulatory oversight. This will include aspects such as inspections and train operations (one-man crews), as well as MMA’s safety management systems to determine if there are any deficiencies that need attention.

Next of kin

TSB participated in a Sûreté du Québec briefing with the victims’ next of kin at which the TSB investigative process was explained. As per our investigative process, we committed to keep them informed during the investigation.

Visit the active investigation page for more information about this accident.

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