MJK,
Hello again! I agree with all Tommy said, gonna be downright brick in upper Europe. It stays cold right through March. Living in london right now and if I take the deal I have been offered I will be in NYC during December for 2-3 weeks training for the opening here in March, we could work something out if you are interested. My apartment is right behind Clapham Junction Rail Station, lots of travel by train over here. Waterloo Station is 8 minutes away! I have got some favorite spots as a list as well. You do not need more than 2 days in London however.
I would think a trip to Scotland or Ireland would be much better but that would involve more than a train ride! I may be some help in Amsterdam as well for accommodation but it is not mine so planning would be explicit. As I have lived in France before I would have to say a day is all you need in Paris, sightsee shop eat and get out, the annoying French all live there. Visit Lyon, Dijon, or Biarritz! And if you go to Biarritz you may as well go to San Sebastian and upper Spain! Actually why not Spain, Portugal, and Morocco?
Sorry started to ramble...... Is it EuroRail or Trail or pass?
There is an app for eurostar.
Toby