Hambuk Line
The planned Komusan–Musan section, using the Hambuk Line name, was finally opened in 1937 by the North Chosen Colonial Railway (a subsidiary of the Chosen Railway), whilst the section between Musan and the Kilhye Line (at Paegam instead of Hapsu as had been planned and named Paengmu Line) was finally completed as a narrow gauge railway by Sentetsu on 1 December 1944.