pony engine

English

Noun

pony engine (plural pony engines)

  1. A small locomotive used for shunting wagons, etc.
    Synonyms: shunter, shunting engine, switcher
  2. (Canada, US, dated) A small gasoline engine serving as an auxiliary to a diesel engine (mainly in older designs from the 1930s to 1950s), providing heat to warm it up and, when engaged with a clutch, providing cranking to start it up.
    Synonym: pony motor
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