I think one of the most fun routes in TS2020 was the Portsmouth Direct Line from Waterloo to Portsmouth Harbour. I would be great to see this in TSW. With South Western Railway expecting delivery of the new Class 701 maybe that could be incorporated into the stopping services, or keep the old 455s if the 701s data isn't available. This is a route that thousands of London commuters are familiar with, and one that many would enjoy driving in the game.