The route from Shunan to Yamaguchi is served primarily by the Sanyo Line, featuring both local and rapid train services. The Rapid Service trains, which include the Commuter Limited Express, can reach speeds of up to 120 km/h (75 mph) and take approximately 30 minutes to complete the journey with fewer stops at significant points like Tokuyama and Yamaguchi stations. On the other hand, local trains may take longer, up to 45 minutes, due to additional stops at smaller stations along the line.
Travelers can choose between different classes of service, with standard seating available on both local and rapid trains, ensuring a comfortable journey. Rapid trains are preferred for speed, while local services offer more access to various regional destinations, making them suitable for local commuters. Overall, the Sanyo Line provides efficient connectivity between these two cities in Yamaguchi Prefecture.