How many units are required for a self-contained set of Trent Valley diagrams? Could they use all the 350/4s as they are, including the improved First Class for the longer journey which might bring in more revenue?
I'd pay for proper 2+1 First for that journey.
I don't know how difficult/easy it would be to try and keep units in self-contained areas.
A quick look at a few today....
350370 for example was empty off Wolverhampton to work a service from Birmingham to Euston, then one back to Northampton, ECS to Milton Keynes to work a local service to Euston, then a Euston to Rugeley service, back from Rugeley to Euston and then finally a Euston to Crewe service via Birmingham and Wolverhampton ending up at Crewe LNWR for the night.
350231....Northampton to Euston, Euston to Milton Keynes, Milton Keynes to Euston, Euston to Rugeley, Rugeley to Euston, Euston to Tring, Tring to Euston, Euston to Milton Keynes, Milton Keynes ECS to Bletchley Carriage Sidings for the night.
350373....off Bletchley Carriage Sidings, Bletchley to Euston, Euston to Watford ECS, Watford to Euston, Euston to Milton Keynes, Milton Keynes to Euston, Euston to Rugeley, Rugeley to Birmingham international, International to Liverpool, Liverpool to Euston via Birmingham, Euston to Northampton, Northampton to Kings Heath.
Its a right old mix at the moment with a lot of cross pollination across the varying routes. To dedicate specific subclasses of units to specific areas/routes might be a bit of a challenge!