The journey from Karuizawa to Itoigawa is serviced primarily by the Hokuriku Shinkansen and the Limited Express trains. The Hokuriku Shinkansen, a high-speed train service, operates on this route and can reach speeds up to 260 km/h (162 mph), covering the distance in approximately 1 hour and 40 minutes. This service offers a smooth and quick transit with few stops, making it an efficient option for travelers.
In contrast, the Limited Express trains, while not as fast, provide an alternative route with varying travel times due to more frequent stops, taking around 2 hours and 30 minutes to complete the journey.
Both train types offer comfortable seating and amenities, but if speed is your priority, the Hokuriku Shinkansen is the preferred choice, whereas the Limited Express might cater to those looking for a more scenic route with opportunities to explore smaller stops along the way.