In reply to news post, which Andy H
wrote on Mon, 18 Jul 2005 -
Two points.
Firstly, LT trains work in the same way and I am not aware that they have
had problems.
Secondly, Once a tripcock is struck it remains in the up position until
it
is reset when the unit is uncoupled so the rear unit tripcock will only be
hit once per period of time that the unit is coupled as the non leading
unit.

The only difference being that the LUL trains will get strike the first
signal they encouter leaving the depot at 10mph whilst the Chiltern units
similiar first experience will be a signal at 75mph!

Andyh


The are trip cock testers at Amersham and Harrow. The Chiltern trains
have to pass these OK and they are done at slow speed, even if the train
is not stopping. I'm not sure what happens to the tester once the first
unit has gone past, but in theory it could trigger the second units arm
out of the way. Also, when the A60 stock was first introduced, they
would run 4 car sets off peak, at that time all cabs I assume would have
been driveable, so a similar situation to the 16/168 situation may have
occurred then, i.e. the second unit potentially being tripped at speed,
I assume they solved this!
--
Matthew P Jones - www.amersham.org.uk
My view of the Metropolitan Line www.metroland.org.uk - actually I like it
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