aircraft engine - the engine that powers and aircraft

automobile engine - the engine that propels an automobile

auxiliary engine, donkey engine - (nautical) a small engine (as one used on board ships to operate a windlass)

camshaft - has cams attached to it

gearing, gears, geartrain, power train, train - wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed; "the fool got his tie caught in the geartrain"

generator - engine that converts mechanical energy into electrical energy by electromagnetic induction

heat engine - any engine that makes use of heat to do work

motor - machine that converts other forms of energy into mechanical energy and so imparts motion

reaction engine, reaction-propulsion engine - a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream

causal agency, causal agent, cause - any entity that causes events to happen

choo-choo - a child's word for locomotive

diesel locomotive - a locomotive driven by a diesel engine

dinkey, dinky - a small locomotive

electric locomotive - a locomotive that is powered by an electric motor

cowcatcher, fender, buffer, pilot - an inclined metal frame at the front of a locomotive to clear the track

footplate - the platform in the cab of a locomotive on which the engineer stands to operate the controls

iron horse - (c. 1840) an early term for a locomotive

pilot engine - a locomotive that precedes a train to check the track

self-propelled vehicle - a wheeled vehicle that carries in itself a means of propulsion

shunter - a small locomotive used to move cars around but not to make trips

steam locomotive - a locomotive powered by a steam engine

donkey engine, switch engine - a locomotive for switching rolling stock in a railroad yard

tank engine, tank locomotive - a locomotive that carries its own fuel and water; no tender is needed

traction engine - steam-powered locomotive for drawing heavy loads along surfaces other than tracks

railroad train, train - public transport provided by a line of railway cars coupled together and drawn by a locomotive; "express trains don't stop at Princeton Junction"