Yes, the Swiss Travel Pass is fully valid for travel between Zurich and Interlaken, and it is arguably one of the best ways to make this journey. The pass provides unlimited travel on the entire Swiss Travel System, which includes all trains operated by SBB (Swiss Federal Railways) as well as various private rail lines. When traveling from Zurich (either the city center or the airport) to Interlaken, you can simply hop on any scheduled train without needing to purchase a separate ticket or make a seat reservation, as reservations are generally not required on standard Swiss domestic routes. This route typically involves a transfer in Bern or a scenic detour via Lucerne if you choose to take the Luzern-Interlaken Express, which is part of the GoldenPass Line (also fully covered by the pass). Beyond the train journey itself, the Swiss Travel Pass also grants you free access to public buses and trams in both Zurich and Interlaken, free entry to over 500 museums across the country, and a 50% discount on most mountain excursions, such as the funiculars and cable cars surrounding the Interlaken region.