I think Birmingham New Street to Crewe would be a fantastic addition to the game. This would include both ways which are the slower route via stoke and the faster route on the WCML. There are plenty of stations to call including Wolverhampton and Stafford. There is Crewe Basford Hall for freight stuff as well. You have LNWR, Avanti West Coast and Cross Country running along here so plenty of services. I think the route should come with the Class 390 in Avanti, Class 350 in de-branded london midland and class 66 in EWS with the potential to have it in Freightliner. Potential DLCs could be the Class 221 in both Avanti and Cross Country and Class 323 in de-branded london midland.