(24-06-2010, 09:26 AM)greensky52 Wrote: 5. In Up Goods and Down Goods area, mod answer uses a shunt signal 307 and a main signal 132 in Up Goods, but main signal 137 and 134 in Down? I think these 2 situations are same. I think 134 should be a shunt signal because the movement is wrong direction. What about your view?
I agree with the layout as drawn, but it was a very good question to ask. You correctly identified that 307 is appropriate as a shunt signal for a light engine movement within the station area whereas 137 needs to be a main aspect as it is for a running move for a freight train proceeding along the line. You didn't understand why this same logic doesn't apply at the right hand end. What you missed was the note that freight from G to H reverses at E. You need to work out how to provide the signalling for this to occur. We need to bring a train in on the Down Goods and stop it at 137. Uncouple locomotive, then clear 137 for it to continue along on the down until it can get behind 312, , 312 routed via one of the different ways to single the loco in the up direction until it can get behind 301 (depending on the railway's rules perhaps the driver needs to change end to the other cab, but in some circumstances may continue to drive from what has become the rear cab). Then from 301 back onto its train that was left on the Down Goods, couple up again, then driver's cab is at 134 and is then routed to junction F in order to continue its journey on the other line from the one on which it arrived. Hence 134 is not for a shunting move but a running move after train has reversed direction. Your thinking was right as far as it went; but it hadn't gone far enough.
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6. I put a main signal between point 203B and 204, but the mod answer put signal 205 which I think having the same function as mine. I think it should not put a stop signal in the tunnel, so I put it at the exit
PJW