The journey from Komatsu to Karuizawa is primarily serviced by the Limited Express train, known as the 'Hakutaka'. This train travels at speeds reaching up to 130 km/h (81 mph) and takes approximately 4 hours to cover the distance, making it a comfortable option for this route. The Hakutaka makes important stops at various stations, including Kanazawa and Nagano, providing easy access for passengers in these regions.
Passengers can choose from standard and first-class seating, ensuring a pleasant travel experience. The train features air conditioning and onboard restrooms, with food and drink options available for purchase. While the speed is not comparable to Shinkansen lines, the service offers a solid alternative for travelers looking to journey between these two cities with a good balance of time and accessibility.