As the TSB noted in its 11 September 2013 news release announcing the issuance of safety advisory letters to Canadian and U.S. regulators, test results indicate that the level of hazard posed by the petroleum crude oil transported in the tank cars of the occurrence train was not accurately documented.

For this report, samples were collected from the 9 tank cars at the end of the occurrence train (MMA-002). These tank cars did not derail and were pulled back to Nantes, Quebec after the accident. Samples were also taken from 2 tank cars located at Farnham, Quebec. These 2 tank cars were part of another unit train operated by MMA (MMA-874) that was transporting petroleum crude oil of the same origin as the oil carried by train MMA-002. All the samples were tested and examined. The TSB is releasing the engineering laboratory report documenting this comprehensive analysis in advance of the final investigation report.

The Lac-Mégantic train derailment remains a priority for the TSB, and a team of experts continues to be dedicated to the investigation, which is now in the report-writing phase. If at any stage during the remainder of the investigation the TSB identifies additional safety deficiencies, it will communicate directly with regulators and the industry, and inform the public.

The TSB is an independent agency that investigates marine, pipeline, railway and aviation transportation occurrences. Its sole aim is the advancement of transportation safety. It is not the function of the Board to assign fault or determine civil or criminal liability.

SOURCE  Transportation Safety Board of Canada