NTSB Determines Probable Cause of Fatal September 2022 UP Collision
The probable cause of a fatal September 2022 collision on Union Pacific’s (UP) Sunset Route in Imperial County, Calif., was the routing of UP train ISILB5-07 into Bertram siding, which was occupied by 74 empty intermodal railcars, “made possible by the inappropriate removal of a computer-aided dispatching system block on the siding dispatch center,” according to a National Transportation Safety Board (NTSB) investigation report.