You should add the Grays C2C service, The London Piccadily line, the Elisabeth line, The Jubille Line and Finally the Japan Shinkansen line.
See this thread. https://forums.dovetailgames.com/threads/how-to-and-how-not-to-make-a-suggestion.72089/ Plus there's 9 Shinkansen lines, which one dude?
That was a big jump from London metro to Japanese high speed! ethier way please learn how to make a suggestion.
One London line that would be nice in TSW is the North London + Goblin Line from Richmond to Stratford/North Woolwich and Barking. Though you would need two new trains for the modern era, a 378 EMU and the Class 172 DMU. Three if you include LUL S stock for the District Line between Richmond and Gunnersbury. Intensive passenger service and lots of freight action, not your typical main line radiating from one of the termini.