The journey from Karuizawa to Fukui is primarily served by the Limited Express trains, specifically the Shinano and the Thunderbird. The Shinano Limited Express covers the route at speeds of up to 130 km/h (81 mph), providing a travel time of approximately 3 hours 30 minutes with a comfortable ride and scenic views of the Japanese countryside. Meanwhile, the Thunderbird departs from Kanazawa and connects through Fukui, maintaining similar speeds and travel times.
Both train services offer standard and first-class seating, ensuring a comfortable journey for all passengers. The Shinano Limited Express tends to be favored by travelers seeking a direct service, while the Thunderbird is popular among those wishing to explore destinations in the Hokuriku region. Although this route does not feature Shinkansen bullet trains, the Limited Express trains provide efficient and reliable travel between these two locations.