switch engine(n = noun.artifact) donkey engine - a locomotive for switching rolling stock in a railroad yard;
is a kind of engine, locomotive, locomotive engine, railway locomotive

air engine, aircraft engine, automobile engine, auxiliary engine, bait and switch, bogie engine, diesel engine, dip switch, donkey engine, dual inline package switch, electric switch, electrical switch, engine, engine block, engine cooling system, engine driver, engine failure, engine room, epitrochoidal engine, external-combustion engine, fanjet engine, fire engine, four-stroke engine, four-stroke internal-combustion engine, gas engine, gasolene engine, gasoline engine, heat engine, ignition switch, internal-combustion engine, ion engine, jet engine, knife switch, locomotive engine, on-off switch, on/off switch, otto engine, pilot engine, point switch, radial engine, radiant engine, ramjet engine, reaction engine, reaction-propulsion engine, reciprocating engine, rocket engine, rotary engine, search engine, selector switch, semiradial engine, split switch, steam engine, switch, switch cane, switch grass, switch off, switch on, switch over, tandem engine, tank engine, three-point switch, three-way switch, toggle switch, traction engine, trunk engine, turbofan engine, turbojet engine, underload switch, valve-in-head engine, wankel engine, wankel rotary engine, water engine