I think a great route for dovetail to add is the Stansted Express in modern era. It’s a 50 minute journey covering 30 miles on a class 745 EMU by greater anglia made by Stadler for there FLIRT family. The train stops at Tottenham Hale, Harlow Town, Bishop Stortford, Stansted Mountfitchet and finally Stansted Airport. The route often has different schedules where it skips Harlow town or bishops Stortford and a really early 5:00 AM schedule where it goes nonstop from Liverpool st to Stansted. Also the route may have rail works where it’ll have to go via Stratford when the Hackney Down line is closed or via Seven Sisters if there’s issues near Tottenham Hale. It would be great to have a GA train added into TSW3 and the class 745 would be great. You could also add the class 720 where it will run from London Liverpool Street to Cambridge.
