1) Any unit of on-track equipment designed to be hauled by locomotives; 2) Any unit of on-track work equipment such as a track motorcar, highway-rail vehicle, push car, crane, ballast tamping machine, etc; 3) A railway car designed to carry freight, railroad personnel, or passengers. This includes boxcars, covered hopper cars, flatcars, refrigerator cars, gondola cars, hopper cars, tank cars, cabooses, stock cars, ventilation cars, and special cars. It also includes on-track maintenance equipment.
(FRA2) (FRA3) (FRA4)