Crossword Genius

Run to first-class, primarily luxurious vehicle after finally-expired travel permit (8)

Ross

I believe the answer is:

railcard

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But I can't explain it at all! Could you help me understand?

(Other definitions for railcard that I've seen before include "Warrant for cheaper travel" , "Pass for reduced train fares" .)

I've seen this clue in The Hindu.
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