TheOneKEA wrote:
Clive D. W. Feather wrote:
snip
[+] In general, a signal can only turn green if a train hitting the
train stop of the following red signal *at line speed* will be
stopped before the point of actual danger (e.g. another train).
Designing for the maximum possible speed of all trains would be
unduly restrictive, so designing to the speed limit of the line is
a sensible compromise.


This doesn't make much sense. Are you saying that if a train passes a
red signal at linespeed or higher and gets tripped, the signal in rear
could change to green if the entire train manages to exit that
signal's overlap?

A signal is controlled by all the track circuits between it and the end of
the next signal's overlap. Therefore a signal will show red whilst there is
an occupied track circuit either between it and the next signal or in the
next signal's overlap.


--
Cheers for now,

John from Harrow, Middx

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