In article , Mike Bristow
writes
OTOH hand , when was the last time that you heard of trains being stuck or
cancelled because the 3rd rail fell over?
Sometime around last year, around Bank. I can't remember the
details, but I think the central conductor rail "fell over", rather
than the outer one.

I've seen various reports at various times along the lines of "65
positive shoes found just outside X station because of a displaced
current rail". You even get the really nasty case where the displaced
rail displaces a shoe, which then displaces another piece of current
rail elsewhere, which ....

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Clive D.W. Feather, writing for himself | Home:
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