31-07-2013, 04:54 PM
Hello PJW,
Happy to know that my attempted layout is still useful on the forum. Happier still to do a bit of self-critique.
As you mentioned, main reason for 4 aspect signalling at Station C and Junction D is to protect the point work and the need to turn trains while still enabling the headway requirements to be met.
With respect to standage for freight train on the Up Slow and Down Slow, the concept requires the freight train to stand at the platform track at Station C, for the engine then to draw forward into the Turnback Siding. Signal 121's position should be located another 50 metres further as the last pair of wheels will stand over Points 205 & 206 locking up both platforms.
There should be another signal on the Up Slow platform track at Station C for this purpose and a Limit of Shunt on the Up Slow before Point 210.
Looking at the track circuits re signal 118 I think is excessive. Since it is only a platform starter for a train that has changed end, a minimum overlap of 45 metres should be sufficient.
This much for tonight.
Cheers
Happy to know that my attempted layout is still useful on the forum. Happier still to do a bit of self-critique.
As you mentioned, main reason for 4 aspect signalling at Station C and Junction D is to protect the point work and the need to turn trains while still enabling the headway requirements to be met.
With respect to standage for freight train on the Up Slow and Down Slow, the concept requires the freight train to stand at the platform track at Station C, for the engine then to draw forward into the Turnback Siding. Signal 121's position should be located another 50 metres further as the last pair of wheels will stand over Points 205 & 206 locking up both platforms.
There should be another signal on the Up Slow platform track at Station C for this purpose and a Limit of Shunt on the Up Slow before Point 210.
Looking at the track circuits re signal 118 I think is excessive. Since it is only a platform starter for a train that has changed end, a minimum overlap of 45 metres should be sufficient.
This much for tonight.
Cheers