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Rail transportation safety investigation R19C0002

The TSB has completed this investigation. The report was published on 9 July 2021.

Table of contents

Non–main-track collision and derailment

Canadian Pacific Railway
Yard Assignment CW11-06
Alyth Classification Yard
Calgary, Alberta

View final report

The occurrence

On , at approximately 0655 Mountain Standard Time, the crew of Canadian Pacific Railway Yard Assignment CW11-06 was switching cars eastward into the classification tracks at Alyth C-Yard in Calgary, Alberta, when 56 cars disconnected from the movement and ran uncontrolled down the lead track into the designated emergency track, contacting a cut of stationary loaded hopper cars. As a result of the collision, a total of 22 cars derailed. No injuries were reported. A small amount of fertilizer pellets was spilled and later recovered. The product was non-regulated and posed no threat to the environment.

Safety Communications

Safety advisory letter


Rail Safety Advisory letter 01/20: Inclusions and porosity in a coupler knuckle

Media materials

News release


Failure of a rail car coupler led to 2019 rail yard collision and derailment in Calgary, Alberta
Read the news release

Deployment notice


TSB deploys an investigator to the site of a train derailment in Calgary, Alberta

The Transportation Safety Board of Canada (TSB) is deploying an investigator to the site of a Canadian Pacific train derailment at Alyth Yard in Calgary, Alberta. The TSB will gather information and assess the occurrence.

Investigation information

Map showing the location of the occurrence


Photo of James Carmichael

James Carmichael has been with the Transportation Safety Board of Canada (TSB) in the Railway/Pipeline Investigations Branch since 2008. During his time at the TSB he has been a key investigator in a number of investigations in Western Canada.

Before joining the TSB, Mr. Carmichael held various mechanical positions with four separate railroads. At British Columbia Railway (BCR) from 1980 to 2004, Mr. Carmichael gained considerable experience in the mechanical field; he worked as a carman and progressed into a management role as general supervisor in the Car Department. Over the next 4 years Mr. Carmichael worked for CN Rail and CP Rail as a mechanical supervisor. He was also regional manager for Mechanical with OmniTRAX's Carlton Trail, Hudson Bay, and Okanagan Valley Railroads. He holds certifications as a hazardous materials technician and tank car specialist and was a member of BCR’s Emergency Response Team. Mr. Carmichael lives in Vernon, British Columbia.


  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.