In message , General Von
Clinkerhoffen writes

In effect you are right, the signaller will know when a train has left
the affected section and be able to authorise a train to pass the
affected signal BUT not over the train radio, BUT when passing a signal
failure red the train will then be stuck doing "a speed at which you
can stop short of any obstruction" in other words the train will be
doing under 10 mph (if you try to exceed 10mph the brakes will come
on), 5mph or less is more likely (There's an alert noise if you go over
7mph, doing 5mph keeps the cab noise down!) this is for 2 correctly
working signals, if the next one is also failing (not uncommon) then
the whole process has to be started again.

73 stock doesn't have the sounder at 7mph, but you will still come up in
a heap if you try and go faster than 10mph in slow speed.

Also, the next bit of the rule that you didn't quote also shows how
things get held up: "past the next two stop signals showing a clear or
caution aspect.".

Last time I had to apply the rule at a failing signal it took me 10
minutes just to get through the affected section and a total of 15 mins
from stopping at the failing signal to resuming normal line speed. This
with a 2-3 minute interval service, you can see why the job is fubar in
very short order.

That is why 1 signal failure can FUBAR the whole Met, Hot & Cold, &
Circle line.

And that's just for an automatic signal - it gets worse if there's
points involved as they have to be secured too.
--
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)