I've done it before on the train a few times (last time was to meet family a few months ago). Never in the winter though. However, stayed at the top of a valley with an amazing view. Can only imagine how nice it'd be during the winter. There's also lovely walks/hiking around there, so assuming it's not completely snowed over, I think that'd be great as well.
You can often do it cheaper/quicker by flying to Baden-Baden/Karlsruhe with Easyjey/Ryan Air, but I've not flown.
I've done it before on the train a few times (last time was to meet family a few months ago). Never in the winter though. However, stayed at the top of a valley with an amazing view. Can only imagine how nice it'd be during the winter. There's also lovely walks/hiking around there, so assuming it's not completely snowed over, I think that'd be great as well.
You can often do it cheaper/quicker by flying to Baden-Baden/Karlsruhe with Easyjey/Ryan Air, but I've not flown.