2013 mod 2 part A

[Peter]

What I'm trying to say is I would work out the headway for a stopping train and this would also be the same headway for a non stopping train??

I find the question pretty vague because as the slower stopping train is leaving the station the faster non-stopper will quickly be catching up, obviously the headway for a non stopper will be smaller than a stopper its how you factor them together I'm confused on. I'm not saying do the answer for me just a pointer!!

You are right in the scenario you describe. The question is asking you to look at two different scenarios that may occur at different times in the service pattern. The fast headway is for periods that fast trains follow each other and the stopping headway effectively describes the effect of putting in a stoppig train. How you mix and timetable the trains given the headway would determine the total number of trains that you get through.

Yes, the worst will always rule how you space the signals, but you are looking for the optimum solution which meets the the operators needs but without oversignalling.