Mar 28, 2011 - 5:38 PM
Yes, Half Fare Card is your best bet.
For travel to Munich from Wengen we have found that the most economical approach is to book a ticket from Wengen to Lindau, which is the border station. The HFC will enable you to buy this ticket for half price.
For travel from Lindau to Munich, buy a Bavaria Ticket Partner Ticket. Read about the Bavaria Ticket and restrictions (such as no ICE/EC trains, no big deal) at http://www.bahnland-bayern.de/tickets/bayern-ticket
This gets the two of you (and up to 3 other adults if you pick up friends along the way!) from Lindau to Munich for only 29€. Once you arrive in Munich you can also use it for free travel the rest of the day, up to 3:00 am the next morning. Quite a deal. If you are sure of your travel day (Bavaria Tickets are non-refundable) I'd buy one on line at http://reiseauskunft.bahn.de/bin/query.exe/en. Be sure to select "local transport only" to enable the Bavaria Ticket choice to show up. Also be sure to enter 2 adults, if you leave it at 1 (the default) the partner version of the Bavaria Ticket doesn't show up. Then, with Bavaria Ticket in hand, I believe the train staff at Wengen can arrange the whole route (Wengen to Munich) for you. If you don't buy it on line you will need to get off the train in Lindau and buy it there.
Send me a PM if this is confusing. I have a 20+ page document of travel tips, excursions, restaurant recommendations, etc in Munich area based on my 15+ trips there. There is a whole section on train travel, including Bavaria ticket, but I can't clip and paste that whole section here because the formatting gets screwed up.