In 2026, an Interrail Global Pass offers remarkable flexibility, but it does not cover every single train in Europe. It primarily grants unlimited travel on the national rail networks of 33 participating countries (such as SNCF in France, DB in Germany, and Trenitalia in Italy). While this covers the vast majority of intercity, regional, and local trains, it generally excludes private operators like Italo in Italy or Ouigo in Spain. Furthermore, while the pass "works" on high-speed and night trains (like the TGV or Nightjet), these often require a mandatory seat reservation fee that is not included in the pass price. In major urban centers, Interrail does not cover metros, trams, or buses, as these are managed by local transit authorities. Always check the Rail Planner app to see if a specific private line or high-speed connection requires a supplement.