A Transportation Safety Board investigation has determined the train was on track that failed because of a repair error nearly two months earlier.
The report says maintenance crews had fixed part of the track after finding a broken joint bar.
But it was replaced with the wrong piece, which resulted in the track becoming misaligned and unstable.
The CN train was travelling east near St-Lazare when an emergency brake was applied and several cars derailed.
There were no injuries, fires or evacuations, but about 815,000 litres of oil was released.
CN says it has since installed continuous welded rail on the corridor of track between east-central Saskatchewan and Winnipeg.
The company also requires suppliers to spray-paint joint bars royal blue, to help differentiate them from similar-looking parts.
Editor’s note: 815,000 litres equals 5,126 barrels of oil. Pipeline Online contractually cannot alter or edit copy provided by The Canadian Press.
- 0029 Latus Viro updated Latus phone
- 0031 Lloydminster_Heavy_Oil_Show_20220031 Lloydminster_Heavy_Oil_Show_2022
- 0027 TED_NA Helium 2021_30
- 0028 SIMSA_Energy_Forum_2022
- 0025 Kendalls
- 0026 Buffalo Potash Quinton Salt
- 0023 LC Trucking tractor picker hiring mix
- 0022 Grimes winter hiring
- 0021 OSY Rentals S8 Promo
- 0019 Jerry Mainil Ltd hiring dugout
- 0018 IWS Hiring Royal Summer
- 0014 Buffalo Potash What if PO
- 0015 Latus Viro PO Ad 01
- 0013 Panther Drilling PO ad 03 top drive rigs
- 0006 JK Junior
- 0004 Royal Helium PO Ad 02