No, an Interrail Pass does not include "every" train in Europe, but it covers the vast majority of national, scheduled train operators across 33 participating countries. In 2026, the pass remains the best way to travel through Europe, covering major carriers like DB (Germany), SNCF (France), and Trenitalia (Italy). However, it does not cover private or "luxury" trains (like the Venice Simplon-Orient-Express) or most urban "metro" systems (like the London Underground). A critical peer-to-peer essential to remember is the "Reservation Fee": while the pass covers your fare, many high-speed and night trains in France, Italy, and Spain require a mandatory seat reservation that must be paid for and booked in advance (usually €10–€20). For most regional and local trains in Germany, Austria, and Switzerland, you can simply hop on with your pass and no reservation. Always use the Eurail/Interrail Rail Planner app to check if a specific train requires a reservation, ensuring you don't face a hefty fine from a conductor while zipping between European capitals.