Surely you could put just a IPL at 1300m and use it as a preset shunt for main routes along the DOWN VALLEY BRANCH?
There should be no shunt moves up to such a signal over the viaduct and therefore nothing will stop at it!
To add to this...in my attempt I put main signals at the convergence to the viaduct (as close as possible for standage) but also put main signals at the UP side of station C approaching the branch, this only gives approx 600m signal spacing against a calculated minimum signal spacing of 760m for 4-aspect sequence, can I do this if I make the arguement that the trains will be traversing the junction at on 40km/h and will be approach controlled MAY-FA (33% of 120km/h) if the protecting signal at the viaduct is OFF (therefore no need for braking), and MAR if the same signal is ON (due to Colwich control)?
Also never put full signals in DOWN direction of the VALLEY BRANCH lines as it was only due for standage and a shunt movement out of the branch line up to the next main signal would suffice. This cuts down on the full overlap over the main lines. Or am I being too simple with this?
There should be no shunt moves up to such a signal over the viaduct and therefore nothing will stop at it!
To add to this...in my attempt I put main signals at the convergence to the viaduct (as close as possible for standage) but also put main signals at the UP side of station C approaching the branch, this only gives approx 600m signal spacing against a calculated minimum signal spacing of 760m for 4-aspect sequence, can I do this if I make the arguement that the trains will be traversing the junction at on 40km/h and will be approach controlled MAY-FA (33% of 120km/h) if the protecting signal at the viaduct is OFF (therefore no need for braking), and MAR if the same signal is ON (due to Colwich control)?
Also never put full signals in DOWN direction of the VALLEY BRANCH lines as it was only due for standage and a shunt movement out of the branch line up to the next main signal would suffice. This cuts down on the full overlap over the main lines. Or am I being too simple with this?