NCL to DON - but including the high level bridge, and maybe even line to Sunderland, would be my preferred one of the two.
I think York has to come sooner or later. The route hopping potential will be brilliant for future DLCs.
York to Newcastle set in the late 70s. Perfect opportunity to introduce the Deltic. Would happily take a rail tour dlc if produced in current day
Newcastle to York might be doable but needs to be with Deltics and maybe Paxman Valenta HST’s not the modern electric stuff.