The Newcastle to York route set in intercity swallow era. Route has a travelling time of about an hour ish and distance is 73 miles long. ROLLING STOCK 43 HST Paxman Valenta (IC 125/Swallow Livery) Class 91 Class 90 Sprinters Pacers.
It would be great to have Newcastle to York but set in the late 1970's, as that would allow the existing Class 08, 31, 45, 47 and 101 to layer on from the Northern Trans-Pennine route. Include a BR Blue Grey Valenta-engined HST or a Class 55 Deltic, with BR Blue liveries for the Class 20 & 37 - that would be a fantastic route with a lot of variety!
Okay yeah... this is definitely one of the few mainline routes I'd prefer as diesel then modern or steam.