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Document Series
Accident Investigations
Federal Railroad Administration
Accident Date
Accident Type
Derailment (DRM)
Railroad Name
BNSF Railway

Winslow, AZ
United States

Accident Number
Investigation Status
Subject Accident Investigations
BNSF Railway, derailment, dynamic brake, buffing or slack action excessive, train make-up, fatigue

On Monday, July 6, 2020 at approximately 6:00 a.m., MDT, a BNSF freight train derailed 29 railcars on the Gallup Subdivision near Winslow, Arizona.  No injuries were reported.  There were no hazardous materials released.  The probable cause is cause code H519- Dynamic Brake, too rapid adjustment.  Contributing to the cause of the derailment was a block of 5 empty cars placed ahead of a block of 6,900 trailing tons, cause code H-504- Buffing or slack action excessive, train make-up and FRA fatigue analysis sound fatigue was present in both the engineer and conductor which may have had a contributing effect, cause code H199- Employee physical condition.

Last updated: Monday, July 6, 2020