In article , David Hansen
writes
there are questions for the railways about whether
a failure on this relatively small scale should have affected
services over such a wide area.

The report I saw said the grid fault was at Wimbledon. Is it possible
that most of the Underground's power is brought in that way - it would
plumb into the existing wiring from Lots Rd rather easily.
--
"It used to be that what a writer did was type a bit and then stare out of the
window a bit, type a bit, stare out of the window a bit. Networked computers
make these two activities converge, because now the thing you type on and the
window you stare out of are the same thing" - Douglas Adams 28/1/99.