Mar 6, 2018 - 8:30 PM
in reply to rockoyster
Good advice (as always) from Rockoyster.
The SBB website will tell you the fare Wengen - Salzburg with the HFC applied to the Wengen - Buchs part of the journey. Simply use the drop down menu to indication you have an HFC. The selection is "Half-Fare Travelcard 1/2/3-year" as the site is geared to Swiss residents and that's what they have. But it is the same for the tourist one month Half Fare Card. You can either buy the tickets on the site or once you arrive in Wengen and you are more sure of your schedule/timing. The Wengen train station can sell you a single ticket with the half fare reduction applied.
All that said, you may be able to get a Saver ticket if you book in advance which oftentimes works out to be even less expensive than with the Half Fare Card. Plug in your dates and see what you get. The down side to a Saver ticket is that it is only valid for the time/day/train you buy the ticket for with no changes or refunds.
If you don't already have your car rental agreement for Salzburg I highly recommend visiting www.gemut.com. We never rent any other way when visiting German-speaking countries. Great information, great service, great value for the money. If nothing else download and read their document about renting cars in Europe.