In article . com, MIG
writes
I think more of it tends to be able to couple both ways nowadays. The
C stock on Hammersmith, Circle and Edgware Road lines always could, for
obvious reasons. The A stock on the Metropolitan could as well
(although now many units only have the driving equipment at one end),
for less obvious reasons. I suppose because of Watford.

Whether or not it can, the Metropolitan Line working timetables take
care to keep trains the same way round. When a train stables at night at
Rickmansworth after coming from Watford, the same train goes via Watford
in the morning. [By "same train", I mean that if the former stables in
siding 26N, then the first working from 26N will run via Watford.]

There are also some "train turning" conditional paths, running
Neasden-Watford-Ricky-Neasden (or the other way round).

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