I'm glad we're in agreement. I was thinking the line to Freiburg on the other end, but considering it (Frankfurt-Karlshrue) is a high speed line...
At large, it feels a bit short as presented, but I definitely like this route. Multi-country routes are definitely rare in TSW, and this would be...
I agree with this route, and I actually been thinking the same thing. It would be a very nice 200 km/h mainline with a good balance for speed...
Separate names with a comma.