my guess is they will stay with chiltern, the problem with the 67's on long distance routes is the size of the fuel tank, 1200 litres i believe
More like 1200
gallons (Probably 1100 really): 67s have a 4927 litre fuel tank, which is slightly less than a low emission shed, so their use on particularly extensive diagrams is probably a bit limited.
The 67s were unfortunate in being ordered and delivered a very short time before the postal traffic they were designed for dried up. Its good to see that they are now finding some use on passenger workings, however I dont see the fleet of 30 locos as being particularly intensively used.
As concerns the WSMR rolling stock, I reckon that two rakes will go to ATW if/when they switch to class 67 operation on the WAG Express: The rest will go to Chiltern for an interim period at least: Ive heard no progress on Chilterns refurbished mark 3 fleet, and the carriages owned by DB designated for that work could easily be refurbished for the planned Grand Central services instead. Hasnt there been talk of Chiltern setting up a Business Class on the loco hauled trains? If so, then the Wrexham and Shropshire rakes are perfect for the job: Stick an extra Cargo-D mark 3 into each set and voila, three loco hauled five carriage rakes.
Id hope that new homes can be found for the carriages quickly, as the idea of carriages that have only been recently refurbished languishing at Long Marston is crazy.