Railway Investigation R16E0051

Table of contents

Main-track train collision

The occurrence

On 04 June 2016, at about 0748 Mountain Daylight Time, Canadian National Railway Company freight train Q11251-03 was proceeding eastward on the Edson Subdivision when it collided at 18 mph with the tail end of train M30251-02 at Mile 34.9 near Carvel, Alberta. No cars derailed as a result of the collision. There was minor damage to 1 empty hopper car on train M30251-02. There were no injuries.

Map of the area


Photo of Greg Cronkright

Greg Cronkright joined the Transportation Safety Board (TSB) as an investigator in 2014 after a career with Canadian National (CN) spanning five decades.

He held various union and management positions in the transportation department of the railway in Western Canada for most of his career. Prior to his retirement from CN, Mr. Cronkright worked in the Rules and Training group.

Transportation Safety Board 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 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.



Railway Investigation Report R16E0051
Main-track train collision
Canadian National Railway Company
Freight trains Q11251-03 and M30251-02
Mile 34.9, Edson Subdivision
Carvel, Alberta
04 June 2016

Media materials

News releases


2016 train collision near Carvel, Alberta, highlights TSB's calls for physical defences to ensure railway signals are followed
Read the news release

Deployment notices


TSB launches an investigation into a two-train collision near Carvel, Alberta
Read the deployment notice