Because of the seasonal schedule change that occurs the 2nd Sunday of December, you may not be able to buy a train ticket that leaves after December 10th. According to the Man in Seat 61 (http://www.seat61.com/news.htm#.V-fTJyErLq4) , here are the dates when the bookings will open:
French Railways SNCF will open bookings for dates 11 Dec onwards on 13 October.
German Railways DB will open bookings for dates 11 Dec onwards on 18 October.
Austrian Railways bookings already open, except for their night trains.
Italian Railways Trenitalia has started loading trains in blocks, so you'll see some trains open for booking and other trains missing. I'm already getting the usual emails from worried travellers 'Are they cancelling all trains before 11:00 in December?" etc. etc... No, of course not, just the timetable change data loading issues. Again