Kyushu Shinkansen
The West Kyushu Shinkansen route to Nagasaki was also initially proposed as a Super Tokkyū line from Takeo-Onsen. However, after construction commenced the proposal changed to incorporate GCTs, resulting in the Takeo Onsen to Nagasaki section (due to open in March 2023) being constructed as standard gauge lines. The service is proposed by GCTs using the Hakata to Shin-Tosu section of the Kyushu Shinkansen, then the narrow gauge line to Takeo Onsen, then the new West Kyushu Shinkansen line for the final section of the trip.