Excellent! I just travelled through Cologne on my way to The Hague from Zurich with Deutsche Bahn. Do it every other week. For sure Deutsche Bahn isn't necessarily a reason for not going sailing, you never know where you end up, and at what speed. Why do I do that, you may well ask, I'm afraid I can't tell otherwise it would convert this thread into a non-forum-rules-abiding-you're wrong/I'm right festival.
But anyway, before hitting the ice there are some non-frozen waters to the north which are excellent for sailing of course. I really enjoyed my short stay in Kiel en route
from Haderslev. The Baltic
is great, loved it.