Conductor's place (3)

I think it could be either:

Which length description are you looking for?:

train

'conductor's place' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for train that I've seen before include "Rail service" , "Prepare for public transport?" , "union's lengthy item" , "Do exercises" , "become physically fit" .)

I've seen this clue in the Newsday.

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