The route from Karuizawa to Ueno is primarily served by the Hokuriku Shinkansen, an efficient bullet train that connects these two important locations. The fastest service, known as the Asama, can reach speeds up to 260 km/h (162 mph), completing the journey in approximately 1 hour and 30 minutes with minimal stops. In contrast, the Kasumigaseki Shinkansen, which operates on the same route but makes additional stops, takes about 2 hours to reach Ueno from Karuizawa.
Both trains offer a range of seating options from Ordinary to Green Class, ensuring a comfortable experience for all passengers. The Asama is particularly favored by travelers prioritizing speed, while the Kasumigaseki provides greater access to smaller towns along the way. The onboard experience includes comfortable seating, electric outlets, and a selection of snacks and beverages.