On Tue, 19 Jul 2005 17:56:37 +0100, "Matt Wheeler"
wrote:

The leading tripcock will only hit a trainstop if the signal is
being passed
at red, not usually done.

The rear tripcock is on the wrong side of the track to connect with
the
trainstop.

So is that to imply that there's no tripcock-equipped lines that are
signalled for bi-directional working?

If there is (on the Met), Platform 2 at Amersham and Platform 5 at
Harrow on the Hill may be bi-di. I can't be sure about Amersham, but
i've seen A stock in platform 5 at harrow (Chiltern, london bound),
when on an Aylesbury bound train in platform 6, and pretty sure that
the platform 5 train was shown as for Rickmansworth.

As was demonstrated during the weekend closures for the Wembley Park
works, there is plenty of bi-directional trackwork to the west of
Harrow-on-the-Hill station, and trains can reverse east-to-west in
almost any platform. Platform 2 (the one you describe as 5) has
electric rails solely for this purpose.