If capacity is the real issue, which I think it is, I still sense that the capacity options have not been given full consideration. Capacity is not a train issue, it is a system issue. In otherwords how can you add capacity to the whole system? this has to be a combination of technology, information, pricing and management. So, what might add capacity?
1. double deck trains - yes I understand the loading guage issue
2. replace trackside signalling with dynamic on train signalling - if you can platoon trucks, why not trains
3. improve station functionaility - make it easier to get on trains, new London Bridge is an example of 'access all platforms' from many points
4. more trains dividing or combining on route - effectively ensuring every train at terminal is full length and full
5. pricing - needs to be more dynamic - something around a 'cost plus' basis, for example travel on a train out of Euston am. base fare £X, but each train is above or below that price
6. more station bypass lines where you need them, basically making the current inflexibility of fast and slow lines redundant
I appreciate this is not a comprehensive list, but applying a systems thinking to more than just one line East Coast, Midland, West Coast and via Banbury might just make a considerable difference?
Access to work whilst on the train making journey time less important? LESS important, reliability and capacity need to be addressed...but please can we consider the Swiss approach, as well we as the French one?