49 CFR 840.2 - Definitions.
As used in this part, the following words or phrases are defined as follows:
(a) Railroad means any system of surface transportation of persons or property over rails. It includes, but is not limited to, line-haul freight and passenger-carrying railroads, and rapid transit, commuter, scenic, subway, and elevated railways.
(b) Accident means any collision, derailment, or explosion involving railroad trains, locomotives, and cars; or any other loss-causing event involving the operation of such railroad equipment that results in a fatality to a passenger or employee, or the emergency evacuation of persons.
(c) Joint operations means rail operations conducted on a track used jointly or in common by two or more railroads subject to this part, or operation of a train, locomotive, or car by one railroad over the track of another railroad.
(d) Fatality means the death of a person either at the time an accident occurs or within 24 hours thereafter.