I would like to see the Waterloo to Windsor as it would be a great new route to try and create scenarios using the Jubilees 8F and Flying Scotsman for Railtours called the Royal Windsor Steam Express plus timetabled services with Class 455s and 423 VEPs in the Old South West Trains Livery
I’d add the Hounslow Loop onto this as well, with the possibility for a branch to strawberry hill / shepperton added later more for the general timetable aspect + the addition of more stations and route tasks/scenarios