"Peter Masson" wrote in message
...

"Clive Coleman." wrote
It used to be a sackable offence to leave any train standing on a line
BR or LT, so unless rules have changed, all trains will have a driver on
board and the depot is most likely to be where their car is to get home.

But an electric train stranded out the line with no power is not going to
go
anywhere, whatever the signals say.

Peter

And quite probably because there is no traction supply there will be no
supply for the signals either. Also most underground lines also rely on
compressed air to operate the trainstops and point machines. All these
supplies come from substations dotted along the line. No supply in = no
supply out. Most if not all stations now have a UPS back up system to
supply lighting CCTV and PA systems for about 1 hour. After that runs
down, complete and utter blackness.

Bruce