Don't know if it is too late to take advantage, and forgive me if this has been discussed before, but if you are taking the train after flying from USA on LH or UA and/or if you think you could refare at this point and save $ on your intra-Europe flights, then this might be for you:

See more of Europe with Lufthansa's Eurofare.
Buy a round-trip transatlantic ticket on Lufthansa or United Airlines...
Lufthansa's Eurofare is the most practical and economical way to do more traveling in Europe. Purchase a round-trip transatlantic ticket on Lufthansa or United Airlines for travel from November 01, 2000 to March 31, 2001, in any class of service, and build it into a Lufthansa Eurofare ticket. It couldn't be easier.

...and add up to 6 flights within Europe at $89 each!
Just combine additional Lufthansa flights within Europe. Choose from more than 100 cities in 35 countries, and add up to 6 additional flight segments to your transatlantic ticket for only $89 each! That is your Eurofare ticket! Your European flight segments must be booked and purchased with your transatlantic ticket. All travel must be completed by April 7, 2001. Other restrictions may apply. Subject to change without notice. For complete Terms and Conditions click here or please call Lufthansa at 800 399-LUFT.

http://www.lufthansa-usa.com/