Traveling from Fukui to Karuizawa is primarily serviced by the Hokuriku Shinkansen, which offers two types of trains on this route: the Kagayaki and the Asama. The Kagayaki is the fastest option, reaching speeds of up to 260 km/h (162 mph) and covering the distance in approximately 3 hours, providing a limited number of stops including Nagano and Matsumoto. The Asama, which is slightly slower, completes the journey in around 3 hours and 30 minutes, making additional stops at stations such as Joetsu Myoko and Ueda along the way.
Both trains provide various seating classes, including Standard and Green class, and come equipped with amenities such as power outlets and complimentary Wi-Fi. The Kagayaki is preferred by those looking to minimize travel time, while the Asama caters to passengers wishing to explore more stations along the route.