旧丰后森机关库，玖珠

The Former Bungo Mori Roundhouse in Kusu, Oita Prefecture, is a preserved railway facility originally constructed in 1934 during Japan's steam locomotive era. This circular engine shed was built to service and maintain steam engines on the Kyudai Main Line, which connected Kumamoto and Oita prefectures through the mountainous interior of Kyushu. The roundhouse features a turntable at its center, used to rotate locomotives into individual maintenance bays arranged in a semicircular pattern.

The roundhouse represents an important piece of Japan's industrial railway heritage. As steam locomotive facilities have been demolished or left to decay across the country, the Bungo Mori Roundhouse stands as one of the few remaining examples of this architectural type. The structure demonstrates the engineering solutions developed for maintaining heavy machinery in the pre-war and early post-war periods. The facility's preservation reflects growing recognition of railway infrastructure as significant cultural property, documenting Japan's modernization and the communities built around railway operations.

Visitors can explore the roundhouse structure and observe the working turntable, which has been restored to operational condition. The facility displays vintage steam locomotives and railway equipment from the Kyushu rail network, allowing close examination of the mechanical systems that powered Japan's transportation during the steam age. The turntable occasionally operates for demonstrations, rotating locomotives as it would have during active service. Informational displays provide context about the roundhouse's role in regional railway operations and the daily work of engine crews and maintenance staff.

The roundhouse is located approximately 2 kilometers from JR Bungo Mori Station on the Kyudai Main Line. Visitors can reach the site by taxi from the station or by walking, though the route involves some uphill terrain. Limited bus service may also be available. Admission is free, making it accessible for railway enthusiasts and travelers exploring Oita's historical sites.