In message
, at
04:44:08 on Fri, 10 Sep 2010, Alan Ben It
remarked:
Surely it was still failsafe? *No trains were signalled to collide with
each other.

Yes they were. One train was on the line working in the wrong
direction.

And what makes you think the train coming towards it had not been
stopped as a result of the erroneous train occupying a track circuit (in
that sense "ahead of the correctly routed train")?

Just curious; I haven't seen this detail discussed, have you?
--
Roland Perry