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Short Definition
Motive power to a train - the train's engine.

Locomotive is a generic term for the vehicle, or vehicles, providing the motive power to a train. In Digital Command Control, the locomotive can be a single unit, a group of units coupled together in an MU (multiple unit), or multiple units distributed in the train, but responding to a single command set as an MU.

They can be powered by electricity from a third rail or overhead wires, a diesel or gasoline engine, diesel-electric, or steam. Some steam locomotives are fireless, where their pressure vessel (boiler) is filled with steam under pressure and refilled as needed.

Roger Puta's Canadian Cab Ride, Stratford Ontario

Canadian Pacific Selkirk class 5927 takes on oil at the South Edmonton shops