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Rail transportation safety investigation R18D0069

The TSB has completed this investigation. The report was published on 9 December 2019.

Table of contents

Main-track train derailment

Canadian Pacific Railway
Freight train 142-14
Mile 36.6, Winchester Subdivision
Saint-Polycarpe, Quebec

View final report

The occurrence

On , at approximately 1845 Eastern Daylight Time, Canadian Pacific Railway (CP) freight train 142-14 experienced a train-initiated emergency brake application at Mile 36.6 on the south track of CP’s Winchester Subdivision, near Saint-Polycarpe, Quebec. An inspection determined that 22 cars had derailed. There were no injuries and there was no release of dangerous goods.

Safety communication

Safety advisories


Rail Safety Advisory Letter 07/18: Securement of loads on flat cars equipped with an A-frame structure

Media materials

News release


Inadequate securement of cargo on a rail car led to July 2018 derailment near Saint-Polycarpe, Quebec
Read the news release

Deployment notice


TSB is deploying an investigator tomorrow morning to a derailment in Saint-Polycarpe, Quebec

Dorval, Quebec, 16 July 2018 — The Transportation Safety Board of Canada (TSB) is deploying an investigator tomorrow morning to the site of a Canadian Pacific Railway train derailment in Saint-Polycarpe, Quebec. The TSB will gather information and assess the occurrence.

Investigation information

Map showing the location of the occurrence


Photo of Don Mustard

Don Mustard has been a senior investigator with the Transportation Safety Board of Canada (TSB) for more than 20 years. He has led and supported numerous rail and pipeline accident investigations and is a specialist in investigative methodology, regulatory affairs, safety management systems and data analysis. Mr. Mustard holds an MS in Applied Analytics from Columbia University and undergraduate degrees in communications and science.

Over the years, Mr. Mustard has been recognized for his contributions to major TSB investigations. He received a Public Service Award of Excellence for his contributions to the Lac-Mégantic investigation and, most recently, for leading the safety management investigation team into the fatal runaway train derailment near Field, British Columbia, in 2019. His investigative work has been presented and published at international industry events, including the International Heavy Haul Association and the International Level Crossing Safety and Trespass Prevention Symposium. His most recent work includes leading the implementation of the Safety Risk Management program at Metrolinx, while on sabbatical from his work at the TSB.

Prior to joining the TSB, Mr. Mustard spent 13 years providing geological and communications services to resource companies and the Canadian Nuclear Safety Commission.


  Download high-resolution photos from the TSB Flickr page.

Class of investigation

This is a class 3 investigation. These investigations analyze a small number of safety issues, and may result in recommendations. Class 3 investigations are generally completed within 450 days. For more information, see the Policy on Occurrence Classification.

TSB investigation process

There are 3 phases to a TSB investigation

  1. Field phase: a team of investigators examines the occurrence site and wreckage, interviews witnesses and collects pertinent information.
  2. Examination and analysis phase: the TSB reviews pertinent records, tests components of the wreckage in the lab, determines the sequence of events and identifies safety deficiencies. When safety deficiencies are suspected or confirmed, the TSB advises the appropriate authority without waiting until publication of the final report.
  3. Report phase: a confidential draft report is approved by the Board and sent to persons and corporations who are directly concerned by the report. They then have the opportunity to dispute or correct information they believe to be incorrect. The Board considers all representations before approving the final report, which is subsequently released to the public.

For more information, see our Investigation process page.

The TSB is an independent agency that investigates air, marine, pipeline, and rail 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.