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pilot engine

noun
1.
a locomotive sent on ahead of a railroad train to see that the way is clear and the track safe.
Origin
1830-1840
1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pilot engine

pilot engine

noun
1.
a locomotive that leads one or more other locomotives at the head of a train of coaches or wagons
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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