Choosing a specific seat on European rail in 2026 depends heavily on the carrier and whether you are using a Eurail/Interrail pass or a point-to-point ticket. On high-speed lines like the Eurostar, TGV (France), and Trenitalia (Italy), seat reservations are mandatory and can often be selected via a digital seat map during the booking process on the carrier's official app. However, for many regional trains in Germany (DB) or Switzerland (SBB), seating is "open," meaning you can sit anywhere that isn't marked as reserved by another passenger. In 2026, if you are a pass holder, you typically use the "Rail Planner" app to book reservations, though some lines only allow specific seat selection (window vs. aisle) rather than a full graphic map. For the best experience, travelers should book 1st Class "Quiet Zone" seats on long-haul routes to ensure a workspace with power outlets and more generous legroom, which have become a premium standard in 2026 European rail travel.