The Transportation Safety Board of Canada (TSB) on Dec. 18 reported that structural failure of a bathtub gondola car led to the 2019 derailment of a CN train proceeding through the CN Paul M. Tellier Tunnel en route from Sarnia, Ontario, to Port Huron, Mich. At the time of the accident, “there was no industry or regulatory requirement to periodically conduct a full inspection of the car to ensure it maintained its structural integrity,” the TSB reported. “As a result, its structural integrity deteriorated and this was not identified. …”