A self-powered vehicle, especially a locomotive, used for pulling cars along a track.
A person or group of people which influence a larger group; a driving force.
Anything used to effect a purpose; any device or contrivance; an agent.
A large construction used in warfare, such as a battering ram, catapult etc.
The part of a car or other vehicle which provides the force for motion, now especially one powered by internal combustion.
A complex mechanical device which converts energy into useful motion or physical effects.
A software or hardware system responsible for a specific technical task (usually with qualifying word).
The power unit of a train that pulls the coaches or wagons.
A country which drives the world economy by having a high level of imports, such as the United States.
A cheer characterized by a slow beginning and a progressive increase in speed.
A traction engine.
Of or relating to the power unit of a train which does not carry passengers or freight itself.
Of or relating to locomotion.