Now that we have this great power of 64-bit and the new engine. I would suggest to have this route which connects the two largest cities of Germany with each other. Especially if you would build this route from Hamburg-Altona to Berlin Südkreuz with all the other services that exist on this route not only the High-Speed connection with the Famous ICE 411 and the IC trains with the BR 101 and the iconic IC wagons. As well as part of the S-Bahn services of each city and the existing regional services maybe even to Schwerin.
Living in Germany I would love to see a German route after we've gotten a US and one UK railroad. Hamburg-Berlin would be a great route leading through a nice and various landscape. Furthermore I am really curious to climb into a German locomotive using as much realistic functions as possible (PZB, Sifa or even Ebula? ).
I´m living in Germany too, especially in Hamburg. It would be very nice to see a route and a train from germany. This route would be very nice in this game.
Based on what I've seen in this route in TS, there would be plenty of freight opportunities as well, especially shunting. I'll add my vote for this route!