I totally agree but the rumour mill and the discussions start now not in 2026.
As i'm sure you know there are normally several plans being formulated in the background way before events happen.
But yes a RUMOUR has no factual content whatsoever. That we know of!!
Fair dues.
Thing is, LNR and WMR will have presumably agreed their plans with the DFT, and the bulk will have been announced re new fleets of trains on cross city, inter regional WCML routes and inter regional diesel routes. That's a lot of new trains they are procuring. And all that was announced and agreed with the manufacturers.
At the same time the WCP is out for tender and envisages the same fleet of trains as now. No less. And we are talking into the late 2020s (with potential extensions in there).
On the face of it there would be no logical reason why LNR would want a tiny fleet of 390s just for the Trent Valley route. They wouldn't be able to run the current route as 390s don't typically do any SDO that I'm aware of hence not calling at Flyde Coast stations. And the current franchise guarantees the Trent Valley service with its current calls as far north as Stafford (then mainline to Crewe). The 350 fleet is perfect for this, once the sets are doubled granted. But they have the wider doors, large areas for hop on off local travel in the Trent and are very accessible too. They're perfect for all journeys of up to two hours for sure. Standing is also viably possible.
Is there any need for tilt on the current Trent Valley service? Not really? It runs slow line North of Nuneaton and with stops at Milton Keynes and Rugby on route the time savings 125mph Vs 110mph I'd argue would be fairly negligible vs the cost of taking on a fleet of say 9 or 10 390s.
If you took out the small stops and just did MK, Rugby, Nuneaton, Tamworth, Lichfield, Stafford and Crewe you'd have to come off onto the slow line anyway at Tamworth and couldnt get back in the fast until north of Lichfield. And then you are stopping again at Stafford. Would it even be worth it? The acceleration of a 350 is top notch anyway for frequent stopping.
If the issue is the standard of the trains then LNR could have the option of running some class 730s on the Trent Valley when they acquire them. Although I'd speculate a 5 car unit wouldn't be enough and whether you would be able to run a double set (10 car) 730 inter regional spec set on that route I don't know.
I'd imagine the 350/1s /3s and /4s will be due a full interior refurb as part of the LNR franchise anyway so there could be slight mods of a more superior feel to the sets after that especially given how TPE have polished theirs up inside.
But for the WCP as things stand I don't think the West coast franchisee or the DFT would be happy with some sort of rival Trent Valley fast tilting service every hour offering competition to their handful of calling peak tilting services, which are set in the calling pattern until at least 2026. It's probably a competition issue (possible revenue abstraction away from the peak West Coast TV calls).