Accident Investigations

HQ-2015-1061 (Finalized)

  • 01
  • Jul
  • 2015
ACCIDENT TYPE: Derailment (DRM)
LOCATION: Maryville, TN
RAILROAD: CSX Transportation
SUBJECT: Accident Investigations, Hazardous Materials, Crashworthiness - Tank Car
KEYWORDS: Derailment, Accident Investigation, Hazardous Materials, Tank Car
ABSTRACT: Technical Report: On July 1, 2015, at 11:45 p.m., EDT, a southbound CSX Transportation (CSX) freight train, Number S541-01 (“the accident train”), originating in Cincinnati, Ohio, and consisting of two locomotives, 45 loaded, and 12 empty freight cars, derailed. Only the 37th car, a tank car with car number UTLX 901717, derailed. The two lead locomotives, first 36 cars, and last 20 cars of the train remained on the track. UTLX 901717 was derailed, leaking, and on fire. UTLX 901717 contained 24,710 gallons of acrylonitrile, stabilized, a Class 3 Packing Group 1 flammable liquid. Combustion of acrylonitrile produces hydrogen cyanide gas and oxides of nitrogen. The train contents also included other hazardous materials including liquefied petroleum gas, propane (Class 2, Division 2.1 flammable gases), and elevated temperature materials.

The plain language Summary Report can be found here.

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