In article , Tim Roll-Pickering
writes
Fenchurch Street/ Liverpool Street - Upminster via Barking (not valid
at Maryland or Forest Gate)

Duplicating the District Line and, more rarely, the Hammersmith & City (plus
a bit of the Central). Annoyingly Forest Gate is my local station.

Fenchurch Street - Upminster is duplicating the District / H&C.

Liverpool Street - Upminster is for two reasons:
(1) duplicates Central Line to Stratford, hence Stratford is legal;
(2) late at night when Fenchurch Street is shut, hence Maryland and
Forest Gate aren't.

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