The Hakata Bay Railway Co. opened the Saitozaki - Sue section in 1904, extending it to the Otani coal mine (1 km beyond Umi) the following year. In 1942, the company merged with the Nishi-Nippon Railroad company, which was nationalised in 1944. The line beyond Umi closed in 1980.
Former connecting lines Sakado station - The 14 km Katsuta line was opened by the Chikuzen Sangu Railway Co. from Yusu (on the
Sasaguri Line) - Chikuzenkatsuta in 1918–19. The connection to Sakado opened in 1942, and the line was nationalised in 1944. Freight service ceased in 1981, and the line closed in 1985. ==References==