Prime mover (locomotive)

main power source in a locomotive

In engineering, a prime mover is an engine that converts fuel to useful work. In locomotives, the prime mover is thus the source of power for its propulsion.[1] The term is generally used when discussing about any locomotive powered by an internal combustion engine.


  1. Boyle, Bryan 'Bob' (2000). The Napier Way. Bookmarque Publishing. p. 149. ISBN 1-870519-57-4.