The Swiss Pass entitles foreign travellers to unlimited travel in Switzerland, including the Bernina Express to my surprise (it does not include the small seat reservation fee). Given that travels from Italy into Switzerland, I was wondering whether the Swiss Pass also covers other routes out of Switzerland.
I'm specifically interested in finding out if there are ways to get a cheaper fare from Zurich to Luxembourg using a Swiss Pass, either by covering part of the trip or provide a discount of some form.