10-03-2014, 03:21 PM
For Aspect Sequence information I suggest you have a look at the Study pack for Module 2 (Aspect Sequences used to be part of Mod2). PJW has put a vast amount of information in that which is not just for UK Mainline. It will probably help you out with Aspect Sequences from a Mass Transit perspective.
Looking at our points from a UK mainline perspective though ...
#2a correct.
#2b For 3 aspect signalling, the yellow-to-red distance should be _between_ [braking distance] and [1.33xbraking distance]. In this case 1000m and 1330m. Now look at all the signal spacing on the mainline: mostly it fits this but there is a problem: Route 13A(M) to S15. This can be done with an "isolated 4-aspect sequence" or by approach controlling that route, for example.
#4 ROL is for a warner route, which is a delayed yellow as your aspect sequence shows. Shunt is a different class of route, and the aspect's meaning is not listed in your answer. I therefore think you are a bit vague on Warner, Call-on and shunt routes?
Hope that does not confuse you too much.
Looking at our points from a UK mainline perspective though ...
#2a correct.
#2b For 3 aspect signalling, the yellow-to-red distance should be _between_ [braking distance] and [1.33xbraking distance]. In this case 1000m and 1330m. Now look at all the signal spacing on the mainline: mostly it fits this but there is a problem: Route 13A(M) to S15. This can be done with an "isolated 4-aspect sequence" or by approach controlling that route, for example.
#4 ROL is for a warner route, which is a delayed yellow as your aspect sequence shows. Shunt is a different class of route, and the aspect's meaning is not listed in your answer. I therefore think you are a bit vague on Warner, Call-on and shunt routes?
Hope that does not confuse you too much.