London Banter - View Single Post - So what's going wrong with the Jubilee line?

[email protected] · May 11th 11, 10:07 PM posted to uk.transport.london

In article ,
(Steve Gardiner) wrote:

*From:* Steve Gardiner
*Date:* Wed, 11 May 2011 14:20:24 +0100

Not if the safety device which does that stopping has been
disabled.

The driver does not have access to this system.

Steve Gardiner

The driver does have access to this - it's either a sealed switch in the
cab (TCIS) or a cock (TCIC) on the front of the train (older stock). There
are certain times when this has to be cut out because of a defect. One
defect where it is cut out is when a train gets tripped and the tripcock
cannot be reset afterwards. There are many reasons for a train to be
tripped, some of which a
a raised trainstop at a signal (passing a signal at danger for whatever
reason) or being tripped on something on the track, such as an obstruction
- ballast piled too high, shoe dropped off, something thrown on the track,
body on the track, etc. If the tripcock cannot be reset, the tripcock is
cut out. If it's not cut out, the train cannot be moved.

Apparently this was the reason for the tripcock being cut out then - the
driver had to apply the rule at a signal, got tripped, and then the
tripcock couldn't be reset (it's reset by pulling on a piece of rope and
this can sometimes fail) and so it was cut out.

Roger