Jul 6, 2016 - 12:51 AM
in reply to Removed user
You may or may not have to change trains at Buchs. I suspect that you do not, and that your train will continue to Zürich, then (change trains) on to Luzern.
If you have purchased a Swiss Travel Pass, all you have to do is show it to a conductor in Switzerland, on any train, when asked. As Arno said...no need to get off the train.
So, buy a ticket from Salzburg to the Swiss border from Austrian railroads (etc.) and stay on the train. After Buchs (more or less) a Swiss conductor will come through, and you show him or her your Swiss Travel Pass.