Fast (train) (7)

I believe the answer is:

express

'fast train' is the definition.
(an express train)

This is all the clue.

(Other definitions for express that I've seen before include "Show" , "Utter - direct" , "Transport" , "Explicit" , "Specific; going at speed" .)

I've seen this clue in The Telegraph, The Times, the Sydney Morning Herald and The Sun.

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