唐津線
The Kita-Kyushu Railway opened the Fukuyoshi to Hamasaki section in 1923, extending it west to Higashi-Karatsu (situated on the east bank of the Matsuura River, opposite the Karatsu Line on the west bank) by 1925 and east to Hakata by 1926. The line was again extended west to Yamamoto where it junctioned with the Karatsu line (establishing Higashi-Karatsu as a reversing station in the process) in 1929, and to Imari in 1935. The company was nationalised in 1937 after which Japanese Government Railways (JGR) designated the track as the Chikuhi Line.