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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation


Document Series
Accident Investigations
Federal Railroad Administration
Accident Date
Accident Type
Derailment (DRM)
Railroad Name
Union Pacific Railroad

Bancroft, ID
United States

Accident Number
Investigation Status
Subject Accident Investigations
Union Pacific Railroad, derailment, buffing or slack action excessive, train make-up
HQ-2020-1388_0.pdf (5.48 MB)

On Wednesday, June 17, 2020, at approximately 8:24 p.m., MFT, a westbound Union Pacific Railroad Company, (UP) freight train, MNPPD-16 (Train 1), traveling at a recorded speed of 35 mph, derailed 31 cars on UP Rocky Mountain Service Unit, Pocatello Subdivision near Bancroft, Idaho. There were no injuries and the only release of hazardous materials was minimal fuel from refrigerated railroad car air conditioners. The Federal Railroad Administration (FRA) has concluded the probable cause of the accident was H504- buffing or slack action excessive, train make-up and contributing cause H599- Other causes relating to train handling or make-up: engineer not receiving additional training prior to handling a train that substantially exceeded previous train qualifications related to the train’s length and tonnage.

Last updated: Wednesday, June 17, 2020