Crossword Genius

Philadelphia train system (5)

Ross

I believe the answer is:

septa

'philadelphia train system' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for septa that I've seen before include "partitions" , "divisions of the airways" , "Chambers will show such divisions" .)

I've seen this clue in The New York Times.
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