The Frankfurt U Bahn is already available in Train Simulator. It would be nice if the Frankfurt U Bajn comes to Train Sim World. There is not much to do because e.g. you simply insert the train models from Train Simulator into the TSW. It would be very nice if you accept and implement my suggestion. Greetings Nabil
You can't copy paste because it's a whole other game engine. It would take a long time for DTG to model such a complex route in the game. They do have the basic layout though, but that doesn't make the development time a whole lot less.