Strangely by route mileage XC is about 50% already done.
And some of the diesel fringes (Aberdeen, Penzance are infrequent), so would not be suprised if over 50% of XC train mileage is on electrified routes.
There's a strong argument to trim the edges and move to new BEMUs only. However I think you'd get political pushback on that.
In NE already electrified is Glasgow-Edinburgh-Newcastle-York-Doncaster
soon will be York-Leeds, and north of Edinburgh towards Kirkcaldy
Also Leeds-Doncaster, of which XC use from Moorthorpe area to Leeds
in the South have Didcot-Reading and Basingstoke-Bournemouth
Basing-Bomo is third rail of course - so an additional system to maintain in addition to the Battery or Diesel mode you need anyway.
In South West Birmingham-Bromsgrove, Yate-Filton, Severn Tunnel Junction-Cardiff
King's Norton - Longbridge fasts and the Camp Hill line as already mentioned, aren't wired. Yate-Filton is a generous rounding of the changeover points, for XC's Purposes it's Bristol Parkway-Bristol Parkway.
I understand that justifying electrification on sections that only see an hourly service is going to be a stretch, but the idea that XC need bimodes (with all they expensive extra servicing for 35-40 years) instead of wiring a few 5-10 mile gaps and using BEMUs on majority of routes is just daft.
Some of these are a lot more than 10 miles. Like Moorthorpe to Birmingham.
They only really need bimodes for the services to Devon, Cornwall, Aberdeen (which is not that many trains). Even fewer bimodes if bit of wiring in Tiverton-Exeter area was done too, as the Torbay services could become BEMU too. I estimate XC only needs about 40 miles total of strategic 5-10 mile wiring sections in longer gaps and it is only Plymouth and Aberdeen that would be beyond reach of BEMUs
But then they still have routes out of reach of BEMUs, so would still need Bi-Modes, or to further trim the services.
Given that:
- XC is not going to stop serving Plymouth
- Is extremely unlikely to stop serving Aberdeen
- Would need third rail or Diesel operation for Bournemouth
- 5-10 mile electrification schemes are going to require expensive 'extension cables' and other feeding arrangements, and gives limited opportunity to recharge batteries so aren't a panacea.
And the idea that XC don't need Bi-Modes is getting rather hard to defend. If they need bi-modes at all, it is most efficient to give them an existing 2-mode vehicle that is already operating on a good portion of their network anyway, and concentrate BEMUs on runs like London-Chester or London-Lincoln that have a solid electric core on which to stand the battery extension on top of.
This also means that when XC run late (to which the Gerry Feinnes answer of 'run the trains on time' simply isn't realistic) they have a consistent fleet to start doing set swaps and so on to get some semblance of service running, and staff training is also kept simple.
Adding a traction battery is probably well within the modular design principles. I'd be surprised if adding shoes and the 750v gear was though.