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.
Should a signal Fail to a restrictive Aspect (Red/Off) the trainstops will
rise, and prohibit the movements of trains past them.
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.

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 majr 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.

Darren Wiltshire
Westinghouse Rail Systems Ltd - An Invensys Company



"Steve Fitzgerald" ] wrote in message
...
In message , Robin May
writes

How can a signal failure on the jubilee line cause so much chaos??
If its affecting the ATO why can't they just drive the trains
manually through the affected section? Or has more than just a
signal gone wrong and they don't want to tell us?

The Jubilee doesn't have ATO, does it?

No it doesn't. Only the Victoria and Central line have it currently.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)