: cab unit, hood unit and box cab. These locomotives are operated by Pacific National in Australia.]] steam locomotive number R707 as operated by the Victorian Railways of Australia.]] RC 4 class electric locomotive repainted in its original livery for the Swedish 150-year railway anniversary in 2006.]] For the Ruby on Rails application see Locomotive . A locomotive is a railway vehicle that provides the motive power for a train. The word originates from the Latin loco - "from a place", ablative of "locus", "place" + Medieval Latin motivus, "causing motion"). A locomotive has no payload capacity of its own, and its sole purpose is to move the train along the tracks. In contrast, some trains have self-propelled payload-carrying vehicles. These are not normally considered locomotives, and may be referred to as multiple units, motor coaches or railcars. The use of these sel

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