I would be very happy about the Hamburg to Hanover route. The route is already available in the Train Simulator. I prefer to drive long-distance trains, but the current routes (Hamburg-Lübeck, Munich-Augsburg, Aachen-Cologne and Duisburg-Bochum) can be played through in about half an hour. The route from Hamburg to Hanover includes several stations for long-distance traffic.
I'd recommend you add more Detail to the Route, like what Rolling Stock you would like, Pictures and Information about the Route
Route was suggested several times... Here's one post with some more information for example. https://forums.dovetailgames.com/threads/route-suggestion-hamburg-hannover.36796/#post-266186
