Crossword Genius

Railway locomotive (6)

Ross

I believe the answer is:

engine

'railway locomotive' is the definition.
(synonyms)

This is all the clue.

(Other definitions for engine that I've seen before include "Machine supplying power" , "Machine doing work" , "Machine converting energy into motion" , "machinery" , "Power unit" .)

I've seen this clue in The Times, the Evening Standard and The Mirror.
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