Sanjo is served by the East Japan Railway Company, primarily through the Sanjo Station. This station connects to the Joetsu Shinkansen, allowing travelers to reach major destinations like Tokyo, Niigata, and Sendai. Local train services link Sanjo with nearby cities such as Nagaoka and Tsubame, enabling easy travel within the region. The network offers both local and rapid services to accommodate different travel needs, providing a reliable means of transportation for commuters and visitors alike.