22-04-2011, 09:40 PM
I have been practising attempting past papers and have the following questions arising from attempting the 2009 Main Line layout:
1.Using distance from G to R calculations at service speed of 120km/h; I determined that 3 aspect at 140km/h permissible speed would be suitable.However,on signalling the layout;I noticed tight spacing generally.Especially between Station B and Junction D and out of the tunnel to the junction after the single line along the down branch.When I tried 4 aspect;the spacings seemed to suit all the layout generally well.Is there a way my calculations could have forewarned me as I would have run into into serious time constraints in the actual exam having started using 3 aspect?
2.For the run around move between F and G;considering the distance, is it ok to signal using shunt moves on the Up Goods considering the distance?
3.Is it ok to signal the line from Station C to Station B using 3 aspect in the C to B direction with a stop and distant signal before the fixed diamond junction and permanent stop signal train length beyond platform for terminating trains.From B to C;use the platform 4 aspect starter to signal all the way to the buffer stop at B.Assuming axle counters for track sections.
1.Using distance from G to R calculations at service speed of 120km/h; I determined that 3 aspect at 140km/h permissible speed would be suitable.However,on signalling the layout;I noticed tight spacing generally.Especially between Station B and Junction D and out of the tunnel to the junction after the single line along the down branch.When I tried 4 aspect;the spacings seemed to suit all the layout generally well.Is there a way my calculations could have forewarned me as I would have run into into serious time constraints in the actual exam having started using 3 aspect?
2.For the run around move between F and G;considering the distance, is it ok to signal using shunt moves on the Up Goods considering the distance?
3.Is it ok to signal the line from Station C to Station B using 3 aspect in the C to B direction with a stop and distant signal before the fixed diamond junction and permanent stop signal train length beyond platform for terminating trains.From B to C;use the platform 4 aspect starter to signal all the way to the buffer stop at B.Assuming axle counters for track sections.