----- Original Message -----
From: "Steve Dulieu"
Newsgroups: uk.transport.london
Sent: Thursday, October 09, 2003 11:22 PM
Subject: Jubilee line screwup



"Darren Wiltshire" wrote in message
. ..
No, the Jubilee Line does not use Full ATO, all Trains are driven by
Drivers. The JL does thogh use ATP, which will be affected by a signal
Failer.
Tha should be easy to understand
Should a signal Fail to a restrictive Aspect (Red/Off) the trainstops
will
rise, and prohibit the movements of trains past them.
LUL Trains have Air brakes, which are Held in the Off possition using Air i
belive. on the Front right of the train, it a 'switch' for want of better
words, which is tripped by a bar raised from the floor.
This bar is only up if the signal is displaying a red (Not lit is assumed
red)
The Safe working of the signaling system is designed to bring things to
a
safe situation in the event of a failere of any kind, most of which can
be
fixed fairly quickly.
If the sigal failed, then the trainstop would rise, and any train passing
the signal would have its emergany brakes applied automaticaly.

As signal failer omn its own in unlikely to be the cause of a services
suspension, but i certainetly havent seen any reports of anythig major
with
the signalling/safety systems
It is more likely that there are other factore included (LUL dont close
lines likely.. its bloody awfull trying to get trackside to do
anything!!)
It all depends on what definition of "Signal failer" you use:
-- Was it a Sole Signal failer, or multiple
-- Was it a Track Circuit Failer which resulted in a signal showing a
Red
-- Was it a signaliing system Comms Error
-- Was it an Error on the Signal Control Center
or any other of a wide range.

Any chance of that again but in English?
--
Cheers, Steve.
If The Good Lord had meant for us to be fiscally prudent, He would not
have
given us the platinum credit card...
Change colour to PC Plod's lights to reply.



Any better?
If not.. email me and i'll explain fully....

Darren Wiltshire