Part of railway signal hardly bent after damage (11,4)

I believe the answer is:

marshalling yard

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'part of railway' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

'signal hardly bent after damage' is the wordplay.
'bent' indicates anagramming the letters.
'after' says to put letters next to each other.
'damage' becomes 'mar' (to mar is to spoil or damage).
'signal'+'hardly'='signalhardly'
'signalhardly' with letters rearranged gives 'shallingyard'.
'shallingyard' put after 'mar' is 'MARSHALLING-YARD'.

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I've seen this clue in The Sunday Times and The Times.

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