咸北線
The Wŏnsan−Kowŏn section was built as part of the Hamgyŏng Line of the Chosen Government Railway ("Sentetsu"); this line ran on the routing of Wŏnsan−Kowŏn (now part of the Kangwŏn Line), Kowŏn−Ch'ŏngjin (now part of the P'yŏngra Line), and Ch'ŏngjin−Sangsambong (now part of the Hambuk Line). The Wŏnsan−Kowŏn section was completed in two parts: Wŏnsan−Ongp'yŏng (at the time called Munch'ŏn Station) on 1 August 1915, and Munch'ŏn−Kowŏn−Kŭmya on 21 July 1916; the Kowŏn−Kŭmya section is now part of the P'yŏngra Line.