A locomotive or engine is a rail transport vehicle that provides the motive power for a train.
If a locomotive is capable of carrying a payload, it is usually referred to as a multiple unit, motor coach, railcar or power car; the use of these self-propelled vehicles is increasingly common for passenger trains, but rare for freight[citation needed] (see CargoSprinter).
These are historic locomotives preserved in museums, currently or formerly, or in heritage railways, currently or formerly, or otherwise.
This is not intended to include deteriorating locomotives that are just still existing somewhere, without being restored or ever open to the public.
DHR 778 (1889), built in Glasgow, the only Darjeeling Himalayan Railway locomotive now located outside India, is now preserved in Oxfordshire, England.