You'd expect to find detectives at end of this secondary route from station (6,4)

I believe the answer is:

branch line

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'route from station' is the definition.
'branch line' can be an answer for 'route' (branch line is a kind of route). I'm not certain of the 'from station' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for branch line that I've seen before include "Secondary railway" , "Subsidiary rail track" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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