Yes, the Swiss Travel Pass provides full coverage for the train journey between Interlaken Ost and Grindelwald. This route is operated by the Berner Oberland Bahn (BOB), and unlike some high-altitude mountain railways that only offer a discount, this specific leg is considered a "standard" connection and is included at 100% of the cost. You simply hop on the train and show your pass (either the paper version or the digital QR code on your phone) to the conductor when asked. This makes the Swiss Travel Pass incredibly valuable for those staying in Interlaken who want to take day trips into the mountains. In 2026, the pass also includes the train to Lauterbrunnen and most public buses in the region. However, it is important to note that if you plan to continue your journey above Grindelwald—for example, taking the gondola to Grindelwald First or the train up to Jungfraujoch—the Swiss Travel Pass will only provide a 25% to 50% discount rather than free travel. Always check the official validity map provided with your pass to see exactly where the "free" lines end and the "discounted" lines begin.