switch engine

noun Railroads.
a locomotive for switching rolling stock in a yard.
Also called switcher, switching locomotive.

1865–70, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Thus manufacturers often have no choice but to acquire a switch engine to handle the switching function.
These yards each have numerous switch engine locomotives that operate nearly around the clock.
The rail car uncoupled from the switch engine and slowly rolled through the closed gate and the closed door.
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