Came back from holiday today to be greeted by the usual tube **** up.
Signal failure on the Victoria line. Something that I hadn't wondered
before is how exactly can you have a signal failure on a line thats
controlled by ATO via a leaky feeder cable? The light signals are
AFAIK there simply as extra information for drivers and arn't really
required anyway so if one fails so what? The train is control by the
ATO cable signals , not a cluster of coloured lights in the tunnel. Or
is "signal failure" just an LU catch all phrase for a computer
failure?

B2003