Yes, the train journey between Lucerne and Interlaken is fully covered by the Swiss Travel Pass. This route is part of the famous Luzern-Interlaken Express, which is a premium panoramic train belonging to the GoldenPass Line. As a pass holder in 2026, you can simply board any of these red-and-white trains without needing a separate ticket. The journey takes approximately 1 hour and 50 minutes, crossing the Brünig Pass and offering stunning views of Lake Brienz and various waterfalls. While the transport itself is free with your pass, you have the option to pay a small fee for a seat reservation if you want a guaranteed spot during peak summer or winter seasons, though this is generally not mandatory. Additionally, the Swiss Travel Pass covers the public boats on Lake Brienz and Lake Thun once you arrive in the Interlaken area, providing a seamless transition from rail to water at no extra cost.