The Izumi to Shimonoseki route is primarily served by the Limited Express Sonic train, which is a comfortable option for travelers. The Sonic operates at speeds of up to 130 km/h (81 mph) and takes approximately 3 hours for the journey, making several key stops along the way, including Kurume and Yamaguchi. This service is known for its spacious seating and onboard amenities, ensuring a pleasant travel experience.
For those looking for a faster alternative, the Sanyo Shinkansen offers a more rapid travel option, with the Mizuho service covering the same distance in about 2 hours and 15 minutes at speeds reaching 300 km/h (186 mph). The Mizuho has fewer stops, making it ideal for passengers who prioritize speed over regional access. However, the Sonic is well-suited for travelers seeking a more scenic route that includes stops at smaller cities.