While you can buy Shinkansen (bullet train) tickets at the station in Japan, it is highly recommended to book in advance, especially in 2026 with the increased demand for tourism. For standard travel between Tokyo and Kyoto, you can usually find a seat 15–30 minutes before departure. However, for travel during "Golden Week" (late April/early May), "Obon" (August), or the New Year holidays, trains can sell out weeks in advance. Furthermore, since 2020, Japan Rail has enforced a "Large Luggage" rule where you must reserve a specific seat with an oversized baggage area if your suitcase exceeds 160 cm (total dimensions). If you don't book this in advance, you may be denied boarding or charged a ¥1,000 penalty. Booking online via the "SmartEX" app or "JR-West" website also grants you "Early Bird" discounts of 10% to 20%. For regional trains or the "Limited Express" Haruka to the airport, booking ahead ensures you have a "Reserved Seat" (Shitei−ken) so you don't have to stand in the unreserved aisles during rush hour.