Locomotion No 1 departed from this Co Durham town as the first locomotive to haul a public railway passenger train (10)

I believe the answer is:

darlington

(Other definitions for darlington that I've seen before include "Town near 24 [MARSKE]" , "rail terminus" , "northern town" , "Terminus of the world's first passenger railway" .)

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

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