The Ungna Line () was a railway line of the South Manchuria Railway (Mantetsu), connecting Unggi with the important port city of Rason.
History Seeking to create a shorter route from Japan to Xinjing and Harbin in Manchukuo, the South Manchuria Railway took over control of the Chosen Government Railway's Sangsambong–Unggi Domun Line in October 1933,朝鮮総督府官報 (The Public Journal of the Governor-General of Korea), 1 October 1933 (in Japanese) 南満州鉄道株式会社全路線 creating the North Chosen Line. Although Unggi was a satisfactory port, a larger one was built at Najin, so Mantetsu built a new line to connect the North Chosen Line to the new port facilities. This line, the Ungna Line (Yūra Line in Japanese), was opened on 1 November 1935. At the same time, the Najinbudu Line was opened to connect the main railyard at Najin to the wharves at the port.
Following the end of the Pacific War and the partition of Korea, the Ungna Line was taken over by the Korean State Railway, which eventually merged it with several other lines to create the current Hambuk Line between Najin and Cheongjin.Kokubu, Hayato, 将軍様の鉄道 (Shōgun-sama no Tetsudō), Shinchosha, Tokyo, 2007
Route + Stations as of 1945 Distance Station name Total; km S2S; km Transcribed, Korean Transcribed, Japanese Hunminjeongeum Hanja/Kanji Opening dateOriginal owner Connections 0.0 0.0 Unggi Yūki 웅기 雄基 16 November 1929Sentetsu Mantetsu North Chosen Line Baekhwa Hyakuka 백화 百花 1 November 1935 6.2 Gwan'gok Kankoku 관곡 寛谷 1 November 1935 15.2 9.0 Najin Rashin 나진 羅津 1 November 1935 Mantetsu Najinbudu Line 3.0 3.0 (from Najin) Namnajin Minami-Rashin 남나진 南羅津 1 November 1935
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