A locomotive is a rail transport vehicle that provides the motive power for a train.
Many of the companies changed names over time; this list attempts to give the most recognisable name, generally the one used for the longest time or during the company's best-known period.
British commercial builders concentrated on industrial users, small railway systems, and to a large extent the export market.
With the almost total disappearance of British industrial railways, the shrinking of the export market and much reduced demand from Britain's railways, few British locomotive builders survive.
An estimate of total steam locomotive production in the United States is about 175,000 engines, including nearly 70,000 by Baldwin.