Crossword Genius

Rigid principles for the running of public transport (9)


I believe the answer is:


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Here is my best explanation:

I believe this clue is a double definition.

'rigid principles' is the first definition.
(I've seen this before)

'for the running of public transport' is the second definition.
(trams run along tramlines)


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This clue was last seen in The Guardian

(Other definitions for tramlines that I've seen before include "rigid principles", "Tracks" and "Side markings of tennis court".)

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