Like "stop and proceed", another Underground specialty with a string
of lethal consequences over the years ?

Generally the stop and proceed rule works fine and is used thousands of
times a year on the Underground. The problem is mostly driver error with
the driver going too fast (too fast so that they can't stop short of any
obstruction - e,g, a train in front) or resuming speed too soon (at a
wrong signal).

Most of the staff errors have been overcome over the year by fitting Speed
Control After Tripping (SCAT) to trains which limits the speed to about
9mph after resetting the tripcock. In fact it always used to be taught
that the speed after applying the rule was "3 to 5mph" or "so you can
count the sleepers".

Roger