​​Rail​ transportation safety investigation R26C0080

Table of contents

    Main-track derailment
    Canadian Pacific Railway Company (CPKC) 
    Mile 108, Aldersyde Subdivision 
    Calgary, Alberta  

    The occurrence  

    On 13 July 2026, a CPKC freight train was proceeding south on the main track when 13 rail cars derailed at Mile 108 on the Aldersyde Subdivision in Calgary, Alberta. Prior to the derailment, the rear half of the train had been separated from the front half, then subsequently collided with the front half of the train as it began to slow down, resulting in the derailment. Eight tank cars carrying dangerous goods were involved in the derailment (seven containing liquefied petroleum gas and one containing argon, refrigerated liquid). There were no dangerous goods released. An unauthorized person who had been on the side of the train at the time of the collision and derailment sustained serious injuries.   The TSB deployed investigators to the site and is investigating. 

    Media materials

    Deployment notice

    TSB deploys a team of investigators following a train derailment in Calgary, Alberta

    Investigation information

    Photos

    Several of the derailed tank cars. (Source: Transportation Safety Board of Canada) Several of the derailed cars came to rest across the railway right-of-way and extending into an adjacent body of water. (Source: Transportation Safety Board of Canada)

      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.

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