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Clive · August 15th 11, 11:34 AM posted to uk.transport.london

In message ,
writes
In article ,
(Clive) wrote:
In message
,
MIG writes
I can recall a 1962 stock train trying to start, and instantly cutting
out,
There weren't any interlocks on 62 stock, you've imagined it.
Huh? Interlocks in the guard's bell circuit came in with the 1938 stock.
No they didn't, I've worked on both 38 stock on the Northern, and 62
stock on the central, and neither have any interlock that interferes
with traction current when the doors are open.
There are contacts through each door circuit that allow the guards light
to illuminate as soon as the doors are closed so a door bounce will give
a "ting" to the driver, but because of the way they work, only one in
each double will be spring loaded for four inches. The 62 stock had
the advantage that when the doors were open an orange light was lit on
top of each car so a guard would know instantly were a door would be
stuck.
--
Clive