The Eurail Pass does not include the full journey to Jungfraujoch (The Top of Europe) for free, but it provides a significant discount in 2026. While your Eurail Pass covers the train journey as far as Interlaken Ost, the specialized mountain railways that ascend from Interlaken to Grindelwald or Lauterbrunnen, and then further up to the Eiger Glacier and Jungfraujoch, are operated by private companies (Jungfraubahn). For Eurail Pass holders, a 25% discount is standard for the round-trip ticket from Interlaken to the summit. As of March 2026, the discounted price for a pass holder is approximately CHF 148 ($189), whereas a full-fare ticket can exceed CHF 220. It is important to note that the Eurail Pass does not need to have a "travel day" used if you are only using it for the discount on the private mountain sector, unless you also use the pass to reach Interlaken from elsewhere in Switzerland on that same day. Reservations are mandatory during the peak 2026 summer season (May–October) and should be booked in advance via the official Jungfrau website.