Yes, the Shinkansen (bullet train) in Japan operates 365 days a year, including Sundays and all public holidays. In 2026, the Sunday schedule is typically classified under the "Saturdays and Holidays" timetable, which often features even higher frequency than weekdays to accommodate domestic leisure travelers and tourists. For high-value planning, it is important to note that Sundays—especially Sunday afternoons—are the busiest times for the Shinkansen as people return to major hubs like Tokyo or Osaka for the work week. This means that "Reserved" seats can sell out quickly, and "Non-Reserved" cars may be crowded. If you are traveling on a Sunday in 2026, it is a "pro-move" to book your seat at least a few days in advance through the SmartEX app or at a JR ticket office to ensure a comfortable journey on the world's most punctual high-speed rail network.