The West Chosen Development Railway (西鮮殖産鉄道, Seisen Shokusan Tetsudō; 서선식산철도 Sŏsŏn Siksan Ch'ŏldo) was formed in 1920 to take over the 762 mm narrow gauge Sanghae—Hwasan—Naet'o line built by the Mitsubishi Ironworks as a company-use railway, 朝鮮總督府官報 (The Public Journal of the Governor-General of Korea), Taishō Nr.