The route from Yatsushiro to Osaka is primarily served by the Kyushu Shinkansen and the Sanyo Shinkansen. The Mizuho Shinkansen operates as the fastest option, reaching speeds of up to 300 km/h (186 mph) on the Shinkansen segment from Hakata to Osaka. This journey can be completed in approximately 3 hours and 15 minutes, assuming a transfer is made at Hakata station. Another option is the Sakura Shinkansen, which also travels the same route but takes around 3 hours and 45 minutes due to additional stops at key locations such as Kurume and Fukuyama. Both services offer various seating classes, including standard and Green Car seating. For those looking for a balance between speed and comfort, the Mizuho is the best choice for its rapid travel time, while the Sakura offers a more leisurely ride with opportunities to explore more stations along the way.