02-09-2011, 08:05 PM
(02-09-2011, 07:48 PM)PJW Wrote: In particular do you consider it would be appropriate to display a flashing aspect sequence at a time that 121 is at red?
I was going to say the same thing, but then I looked at GK/RT0045 which says in section 5.2.3.6
Quote:A flashing aspect sequence shall only be displayed when the approaching train is detected to be in a position that is compatible with the required reading time of the junction distant signal that displays the flashing single yellow aspect and one of the following applies:
a) The first signal beyond the diverging junction is a controlled stop signal that is either one of the following:
i) Displaying an OFF aspect
ii) Displaying an ON aspect and a forward route is set
iii) Displaying an ON aspect at the end of a loop line or platform line where all trains are expected to stop
b) The first signal beyond the diverging junction is an automatic signal
c) The first signal beyond the diverging junction is an isolated distant signal
d) The train protection system is configured to mitigate the SPAD risk at the first stop signal beyond the diverging junction.
Given the layout beyond 121, I assume that condition b) applies. a)iii) may also apply.