28-08-2019, 03:19 PM
Hi TF,
The top line speed for this layout is 160km/h for non stopping passenger trains, rather than the 140km/h for the headway speed.
Part 1A of the paper is asking you to work out the braking distances for all of the line speeds detailed on the layout, i.e:
Non stop passenger trains 160km/h
Stopping passenger trains 100km/h
Freight trains – main line and branch line 100km/h
Your principles look sound, but you need to use the minimum spacing distances based on the highest permissible line speed.
This is why a table might help as it can let you show your detail quite simply and make sure you don't miss anything out.
Once you've calculated the braking distances in question 1A, you can then use the minimum spacing to help you work out the 3 and 4 aspect headways for part 1B.
The top line speed for this layout is 160km/h for non stopping passenger trains, rather than the 140km/h for the headway speed.
Part 1A of the paper is asking you to work out the braking distances for all of the line speeds detailed on the layout, i.e:
Non stop passenger trains 160km/h
Stopping passenger trains 100km/h
Freight trains – main line and branch line 100km/h
Your principles look sound, but you need to use the minimum spacing distances based on the highest permissible line speed.
This is why a table might help as it can let you show your detail quite simply and make sure you don't miss anything out.
Once you've calculated the braking distances in question 1A, you can then use the minimum spacing to help you work out the 3 and 4 aspect headways for part 1B.