This thread has now reached over 500 entries, but no obvious role has yet been found for these units. They are relatively high speed trains designed for longer regional services rather than short urban journeys with frequent stops. They perform well on the Liverpool to Birmingham run.
I still feel that their best future use would be to displace Voyagers from the equivalent Manchester to Birmingham services, with 2tph using 8 coach trains. It would reduce diesel "running under the wires" and release the Voyagers for use elsewhere on non-electrified sectors of the XC network. While I accept that this would need significant revision of train timetables via Birmingham New Street, IMO the pain of doing this would be worth the gain.
No role will be found, I don't think.
Replacing Voyagers with 350s would be getting rid of diesel trains under the wires on one hand, yes. On the other hand, you are also replacing 125mph trains with 110mph trains, and the interior comfort of a 350/2 is far less than that of a Voyager, so they would need interior modifications at minimum if they were to replace Voyagers.
ScotRail is not an option - they normally use 3/6 car trains, so the platforms are designed around this. An 8 car 350 would almost never fit in a Scotrail platform so services would be 4 car max. 4 down from 6 car is not good.
I saw a bit of talk at one point of fitting 350/2s with shoes and giving them to SWR, but:
1) We don't know if it's possible, or practical, to fit them with shoes in the first place,
2) As far as I'm aware they are not compatible electronically with 444/450 and would have to be diagrammed separately which would be a pain.
I saw a few users saying they could go to EMR to run alongside 360s. This seems like a decent proposal on the surface, but I have no idea if EMR have enough depot space, and again we face compatibility issues. As far as I'm aware 350s cannot work with 360s. Also, more 2+3 would be the last thing EMR want.
So they seem likely to end up stored for years and eventually scrapped.
Correct me if I'm wrong on this, but as far as I'm aware, 350s
do not have selective door opening, which is a major thing going against them and really limits the number of routes they can run on. That, and the 2+3 interior is not ideal either.