Reserving a seat on a Swiss panoramic train like the Glacier Express or Bernina Express in 2026 is a separate process from buying your ticket or travel pass. You can book these via the official SBB.ch website, the SBB Mobile app, or the specific website of the scenic line (e.g., rhb.ch for the Bernina). Once you select your route and date, you must look for the "Seat Reservation Only" option if you already hold a Swiss Travel Pass. The cost typically ranges from CHF 10 to CHF 49, depending on the season and class (Prestige Class on the GoldenPass Express being the most expensive). In 2026, it is highly recommended to book at least two to three months in advance for summer or winter peak periods, as these panoramic cars feature floor-to-ceiling windows and very limited seating compared to standard regional trains that run on the same tracks without a reservation requirement.