Editing Rail transport (section)

===Haulage===
Traditionally, trains are pulled using a locomotive. This involves one or more powered vehicles being located at the front of the train, providing sufficient [[tractive force]] to haul the weight of the full train. This arrangement remains dominant for freight trains and is often used for passenger trains. A [[push–pull train]] has the end passenger car equipped with a driver's cab so that the engine driver can remotely control the locomotive. This allows one of the locomotive-hauled train's drawbacks to be removed, since the locomotive need not be moved to the front of the train each time the train changes direction. A [[railroad car]] is a vehicle used for the haulage of either passengers or freight.

A multiple unit has powered wheels throughout the whole train. These are used for rapid transit and tram systems, as well as many both short- and long-haul passenger trains. A [[railcar]] is a single, self-powered car, and may be electrically propelled or powered by a [[diesel engine]]. Multiple units have a driver's cab at each end of the unit, and were developed following the ability to build [[electric motor]]s and other engines small enough to fit under the coach. There are only a few freight multiple units, most of which are high-speed post trains.