I wonder if having TPE run a circular service in both directions looping from Manchester to Edinburgh via the ECML one way and the WCML another way would be worthwhile.
I suggest calling points of:
Edinburgh, Haymarket, Lockerbie*, Carlisle, Oxenholme*, Penrith, Lancaster, Preston, Salford Crescent*, Manchester Victoria, Huddersfield*, Leeds, York, Northallerton*, Darlington, Durham, Newcastle, Morpeth, Alnmouth*, Berwick and Dunbar.
*Fewer calls at these stations.
I'm not sure where TPE depots are so I may come a cropper here.
I suggest calling points of:
Edinburgh, Haymarket, Lockerbie*, Carlisle, Oxenholme*, Penrith, Lancaster, Preston, Salford Crescent*, Manchester Victoria, Huddersfield*, Leeds, York, Northallerton*, Darlington, Durham, Newcastle, Morpeth, Alnmouth*, Berwick and Dunbar.
*Fewer calls at these stations.
I'm not sure where TPE depots are so I may come a cropper here.