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Getting on in the Runaway Train's destination (4,3,4)

Ross

I believe the answer is:

over-the-hill

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'getting on' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for over-the-hill that I've seen before include "No longer at ones' best" , "Elderly" , "Past one's best" .)

I've seen this clue in The Everyman puzzle in The Observer.
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