🚄 Hokkaido Shinkansen at 260 km/h in Seikan Tunnel Over New Year

❓ What changes?

Japan's Ministry of Land, Infrastructure, Transport and Tourism announced that for six days, from December 30, 2026 to January 4, 2027, Hokkaido Shinkansen trains passing through the Seikan Tunnel from the first service until around 3:30 p.m. (until around noon on December 30) will run at 260 km/h on both tracks inside the roughly 54 km tunnel. The normal speed inside the tunnel is 160 km/h, because the Shinkansen shares the tracks with freight trains and must slow down for safe passing. The answer has been the "time-zone separation method": hours when freight trains run are separated from hours when the Shinkansen runs fast, and speeds are raised only during periods with few freight services. This started at 210 km/h over the New Year period of fiscal 2020 and was raised to 260 km/h from the Golden Week of fiscal 2024. The same 260 km/h applies this New Year. Trains covered by the measure are five minutes faster than usual; normally the fastest Tokyo–Shin-Hakodate-Hokuto service takes 3 hours 57 minutes. JR Hokkaido publishes the detailed timetable.

👥 Who is affected?

• ●Anyone travelling on the Hokkaido Shinkansen between December 30, 2026 and January 4, 2027
• ●Passengers on trains that pass the Seikan Tunnel from the first service until about 3:30 p.m. (until about noon on December 30)
• ●Foreign residents in Japan heading to Shin-Hakodate-Hokuto from Tokyo, Sendai or Morioka
• ●Overseas visitors planning a Hokkaido trip over the New Year period
• ●Travellers calculating connection times at Shin-Hakodate-Hokuto

🌏 Impact on foreign residents and visitors

Over the New Year period, reserved seats on the Hokkaido Shinkansen fill up early as holiday travel and tourism overlap. Knowing about this measure lets you pick a train that crosses the tunnel between the first service and about 3:30 p.m., shaving five minutes off the same journey and leaving more slack for connections at Shin-Hakodate-Hokuto to the Hakodate Liner, local lines, the airport or a rental car. Trains later in the day run at the usual 160 km/h, so their times are unchanged. One practical point is how the information reaches you: which trains qualify must be checked in the timetable published by JR Hokkaido, and multilingual notices are sometimes posted later than the Japanese ones. Do not rely only on the journey time shown by a booking site — confirm the actual times for your travel date in official information. Also note that the speed-up applies only inside the roughly 54 km tunnel, and winter snow can still cause delays, so keep your connections generous.