I think a really good addition to the game would be the Woodhead line with the early electrics and the steam locos all working together on one like people have loved the release of the west coast mainline over shap with the 87 I think this is a fairly similar route and a shorter route but still with a LOT of different things to do freight passenger diesel electric and steam it has a bit of everything for everyone the route is already in train simulator (twice) which could be a good reference to go from and also the hadfield section of the route is in train sim world hope others agree with my suggestion
http://www.eastbank.org.uk/pennine.htm https://www.railwaysarchive.co.uk/documents/MetroVickers_MSWLocos1954.pdf some great info and pictures of the 76/77 and the route its self
