Crossword Genius

Train travel (4)

Ross

I believe the answer is:

rail

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

This is the entire clue.

(Other definitions for rail that I've seen before include "Protest strongly (at)" , "Water bird; bar" , "Supported bar - inveigh" , "Means of transport" , "20 backwards, that 7 runs on" .)

I've seen this clue in The New York Times, the LA Times, The Wall Street Journal and the Universal.
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