Can't the tube just go one day without some major fsckup?
Do points often randomly move on their own when a
signals fails to red or whatever the victoria line equivalent is?
AIUI - its in the wiring of the said point/s and signal.
The "green" proves to the driver that the points are both set and LOCKED
(safe)
However with a red signal the associated points *may*
A) Be in the wrong position (being diff to the signalmans diagram)
B) WONT be locked (unsafe) and for that reason those points "could" move as
a train passes over them (remember its a failure and with no "green" there
is no proof thay are locked). Or they may even simply be set for a wrong
route.
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