In message , Barry Salter
writes
At a guess, the train actually terminates at Slough, but is a stopping
service, so it's advertised as terminating at Langley to make journeys
faster.

Probably so. But this policy is bad for occasional travellers, as I'm
standing there thinking "Langley", where on earth is that?

A similar thing applies at Kings Cross, where the slow services to
Cambridge are advertised as terminating at Foxton.

Indeed.
--
Roland Perry