Crossword Genius

Running tracks! (5)

Ross

I believe the answer is:

rails

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'running' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'tracks' is the second definition.
('rail' can be a synonym of 'track')

Can you help me to learn more?

(Other definitions for rails that I've seen before include "Water birds" , "Train tracks" , "Wading birds - dysfunctional person has come off them" , "For trains" , "secretive birds" .)

I've seen this clue in the Evening Standard.
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