I've learned everything I know about taking trains right here at TA. Getting very close to the 90 day window of purchasing, so here it goes....please point out where I am wrong.
Arriving Zurich.. 11AM local time. Need train to Colmar via Basel. No need to purchase train ticket until I arrive in Zurich.
5 days later- Colmar to Paris. Purchase early as possible for best deal. Select 'Antartica' as country. Picket up tickets in Colmar, being sure to have the same card as I used in making the reservation.
I gather 2nd class is just fine, but may book up for this one time experience.