24-09-2014, 09:31 PM
You have spotted some of the deficient braking areas and dealt in some way with them. You have also described the aspects give and them meaning and listed several valid assumptions.
A couple of things wrong or not clear what you have shown.
The * from the FY on 207 - what is this showing. What you have shown means that the driver has had FY in 207, but you are then implying something about 209 stepping up by the condition given - do you mean this to be the condition for 209 to step up from Y + JI to G + JI. If so, it is shown in the wrong place. This would also explain why you have shown an aspect in 209 as Y+P4/G+P4 which does not make sense.
If you have passed 207 at Y but are going through the crossover, you have given no means of showing a proceed aspect in 209 with the JI. If the 209 B was not set before the train got to 207 (ie in time to see the FY, then 209 would be MAR and this needs to be shown.
The way you have drawn 209 signal leaves the JI entries floating in mid air and you should be clear about which signal they belong to.
If you have followed UK practice, it is not normal to allow a flashing sequence through a junction if the signal beyond the junction signal is at red (Unless all trains would normally come to a stand (eg at a station)) so FY -> Y+P4 -> R+OL would not be valid.
Again for 105, you have not shown the MAR condition if the conditions for the flashing sequence have not been met.
The same applies for you * on 105
You have given 103 a ROL. ROL (and hence warning routes) are only provided where the full overlap is not available because of the lie of trailing points, hence there may be overlaps both ways, but they would be full overlaps.
Peter
A couple of things wrong or not clear what you have shown.
The * from the FY on 207 - what is this showing. What you have shown means that the driver has had FY in 207, but you are then implying something about 209 stepping up by the condition given - do you mean this to be the condition for 209 to step up from Y + JI to G + JI. If so, it is shown in the wrong place. This would also explain why you have shown an aspect in 209 as Y+P4/G+P4 which does not make sense.
If you have passed 207 at Y but are going through the crossover, you have given no means of showing a proceed aspect in 209 with the JI. If the 209 B was not set before the train got to 207 (ie in time to see the FY, then 209 would be MAR and this needs to be shown.
The way you have drawn 209 signal leaves the JI entries floating in mid air and you should be clear about which signal they belong to.
If you have followed UK practice, it is not normal to allow a flashing sequence through a junction if the signal beyond the junction signal is at red (Unless all trains would normally come to a stand (eg at a station)) so FY -> Y+P4 -> R+OL would not be valid.
Again for 105, you have not shown the MAR condition if the conditions for the flashing sequence have not been met.
The same applies for you * on 105
You have given 103 a ROL. ROL (and hence warning routes) are only provided where the full overlap is not available because of the lie of trailing points, hence there may be overlaps both ways, but they would be full overlaps.
Peter