I think that the first thing the Waterloo to Salisbury/Exeter route needs in either new or refurbished stock that is bi-mode. This would allow to 159's to move to other parts of the country to replace older stock. Also it would mean you would get rid of diesels out of Waterloo and have slightly improved journey times on the Waterloo to Basingstoke section. If new stock would not be possible to order then would it be possible to convert something like the 458's to a longer distance interior or other stock which is going to be available soon. I think the best way to improve to Waterloo to Exeter route is to have new bi-mode stock on it it in 5 carriage formations which could form 10 carriage trains on the Salisbury to Waterloo section and then split with 5 coaches continuing to Exeter or other destinations as required.
I very much agree that bimodal trains could be very useful.
By being 5 coaches long it could increase capacity between Salisbury and Bristol, there could even be scope (depending on the capacity of the line) for the SWR services to Bristol to be more frequent than the current timetable.
You could also look at other direct services to Waterloo, such as Romsey via Southampton and Salisbury or Weymouth via Yeovil.
It could then make the case for electrification westwards if Basingstoke better. This in then could mean that you could ship some of the more minor stations between Basingstoke and the end of the wires by extending the Basingstoke Stoppers to serve them.
Yes you would lose the faster direct journey times to Waterloo, however you would find most people would change trains at Basingstoke, Andoveror Salisbury to the faster trains anyway. Yet you would find that you would attract a lot more people to using the railways.
This would be because:
- 2tph rather than 1tph to those minor stations
- 4tph between Basingstoke and Salisbury/Yeovil making local travel by train much more attractive
- better connections between stations either side of Basingstoke, making rail travel more attractive for those traveling between those two areas (it would also mean that it would be less of a problem that the WofE line services skip Woking as there would still be direct services between there and Andover, Salisbury and Yeovil)
Overall you'd also have:
- more capacity on the existing services as all long services would be 10 coaches and fewer cabs
- scope for more services to be long services (i.e. some services to Exeter being 10 coaches long)
- scope for more Bristol services
- scope for direct services from other side lines (Weymouth and Romsey), with the Weymouth services potentially being as fast as the existing slower services via Southampton
- a massive reduction in diesel engine usage
- potential for the 158/159's to be moved to other TOC's
- large capacity improvements in the Salisbury 6 services by running then as 5 coach trains (would require ASDO due to short platforms, which could be extended at key locations as required)