On 6 Feb, 11:14, Roland Perry wrote:

In message
, at
02:55:33 on Fri, 6 Feb 2009, Mizter T remarked:

"Signal failure" is a generic term they use for a failure of the
signalling system, and only occasionally means a failure of an actual
signal.

Most likely a track circuit failure perhaps?

On National Rail it's often chavs stealing the wiring (for the copper).

Not something that I recall happening on LU, nor indeed on the
mainline railways in London itself - I'm sure it must have though. I'm
speaking about people nicking wired-in wiring, which excludes this
audacious attempt at theft from London Bridge station that then turned
into a rather dangerous getaway attempt:
http://news.bbc.co.uk/1/hi/england/london/6447625.stm
(Is the guy on the right pulling a face?...)