In 2026, the Japan Rail Pass remains a powerful tool, but it notably excludes several high-profile services. The most significant exclusions are the Nozomi and Mizuho Shinkansen trains—the fastest categories on the Tokaido, Sanyo, and Kyushu lines. While you can use them by paying a specific "supplementary" surcharge, they are not covered by the base pass. Additionally, the pass does not cover non-JR lines, such as the private railways (Odakyu, Kintetsu, Tobu) or municipal subways in Tokyo and Osaka. Local "Liner" trains that require a separate "Liner Ticket" and certain "Sleeper Trains" like the Sunrise Seto/Izumo (unless you pay for the berth) are also excluded. For the 2026 traveler, it is crucial to use the JR-only filter on navigation apps to avoid accidentally boarding a private "through-service" train where the pass is invalid, which could result in a significant on-board fare adjustment.