The end of training? (8)

I believe the answer is:

railhead

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'the end' is the definition.
(railhead is a kind of end)

I can't explain the rest of the clue.

(Other definitions for railhead that I've seen before include "End of the train line" , "end of the line - with 26d" , "You've reached the end of the line here" , "Terminal of the track" .)

I've seen this clue in The Globe and Mail.

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