On 16/08/2011 14:23, Clive wrote:
In message
, MIG
writes
Maybe that's what was happening when I thought the driver had jumped
the bell. It was all very quick though.
But we don't seem to have established whether there was an interlock
with the bell, and how that would work differently at stations from
signal stops.
Someone says "wasn't there an interlock with the bell?" and then
someone else says "no, there was no interlock with the doors".
On the old 38 and 62 stock the driver would flick the power handle to
point one and back to give the train a jolt and let the guard know that
the signal had turned green. The same practice could also be used to
sometimes shake loose sticking doors. From a passengers point of view,
you would feel the train kick and then a loud pop as the line breakers
opened. From the platform, you would also see the arc from the flame
chutes on the line breakers as they were E.P. And exhausted through the
contacts blowing the arc out.

Would they not at also at times release the brakes, using the rush of
air to let the guard know that the signal had cleared?

What about the platform repeaters, BTW?