The route from Kumagaya to Sanjo is primarily serviced by the Joetsu Shinkansen, particularly the Tsubame and the Max Tsubame trains. The Tsubame trains offer a swift travel experience, reaching speeds of up to 240 km/h (149 mph), and the journey takes approximately 1 hour and 45 minutes. The Max Tsubame, which features a unique double-decker design, can accommodate more passengers and travels the same route in a similar timeframe due to its efficient operation.
Both trains provide Ordinary and Green class seating options, ensuring that travelers have various comfort choices. Onboard services include free Wi-Fi, power outlets, and vending machines for refreshments. The Tsubame trains make fewer stops compared to local services, allowing for a more direct route between Kumagaya and Sanjo, while the Max Tsubame is suited for groups or families who enjoy added space. In summary, both train types offer swift and reliable travel with excellent onboard facilities.