Crossword Genius

Train units (4)

Ross

I believe the answer is:

'train units' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for cars that I've seen before include "... when these may be driven?" , "Automobiles" , "Motor vehicles" , "Private vehicles" .)

I've seen this clue in The New York Times, The Mirror, the Penny Press and the King Feature Syndicate.
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