Are you saying that the fare between London and Edinburgh (via ECML for example) will be the sum of the fares between London and Finsbury Park, Finsbury Park and Harringay, Harringay and Hornsey, Hornsey and Alexandra Palace, ...?
Yeah, that's the gist of the idea. The same of course would be true of per-mile pricing, however per-mile pricing has difficulties, as have been discussed on this thread, eg.:
So a full and standing commuter line into London would cost the same per mile as a trip through the Highlands?
My proposal was intended to address that issue, while still having the advantage of eliminating the possiblity that buying a longer-distance ticket and travelling short is cheaper.
There are probably still other issues with my suggestion of course, but perhaps it could help nudge somebody else's thinking in a helpful direction.
I see you propose a peak differential, so each section will have two fares: one for peak and one for off peak. Can you confirm for each, what time restrictions apply to the off peak price? Also when I add up the constituent parts, can you give me instructions on how I calculate whether or not I take the peak or off peak part?
For example if I leave York at peak time but it becomes off peak at Church Fenton, is the entire York-Sheffield ticket peak, as would happen at present?
Each bit of line would probably need to have it's own rules regarding what is peak and what isn't, and how much the peak differential needs to be. My idea of adding the constiuent parts together means you'd only pay peak rate for the sections you travel over at peak time (while that would work for the 'Tethered' ticket type, I see now there'd probably be a problem with flexible tickets).
An alternative way to modify a price-per-mile system might be to have an exit/entrance rate for stations (which is modified for peak etc. in much the same way as the stretches of track in my proposal), added on top of a flat national rate of 1 or two pence per mile for the journey travelled. A problem with that however is that it probably means disallowing break of journey and finding some way of enforcing it, prefrably without ticket barriers (which I don't like, partly because they prevent access to platforms to watch/film/photograph trains or see friends/relatives onto the train).
Moreover, more and more local fares in Switzerland have now become zonal
Anyone have any suggestions of how a zone-based system could, or could not, be applied accross the UK mainland rail network?
In my view a good way forward would be to take the best ideas from each of the distance based pricing structures already in operation to design a system suitable for GB. Unfortunately, I do not see that it is possible to do this in any structured way on an internet forum.
How about suggesting a few good practices and see if anyone here can think of a way to apply them over here?