29-05-2010, 04:33 AM
Hello Peter,
I have two silly questions please:
1) In determining if 3 aspect or 4 aspect signalling is more suitable to meet the headway requirements for Stopping Trains, should the speed used be a) the permitted speed of 120 km/h for Passenger (All lines) or b) the following fast speed of 100 km/h which is for non-stopping trains.
2) Is contingency provision required for the Stopping Headway of 4 minutes which is 240 secs. With contingency provision of 25%, the technical headway would have been 192 secs.
The outcomes (ie. whether 3 aspect or 4 aspect signalling) are quite different depending which of the two variables is used.
Look forward to your reply.
Thank you and Regards
I have two silly questions please:
1) In determining if 3 aspect or 4 aspect signalling is more suitable to meet the headway requirements for Stopping Trains, should the speed used be a) the permitted speed of 120 km/h for Passenger (All lines) or b) the following fast speed of 100 km/h which is for non-stopping trains.
2) Is contingency provision required for the Stopping Headway of 4 minutes which is 240 secs. With contingency provision of 25%, the technical headway would have been 192 secs.
The outcomes (ie. whether 3 aspect or 4 aspect signalling) are quite different depending which of the two variables is used.
Look forward to your reply.
Thank you and Regards