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The Changtu Railway, short for Changchun-Tumen Railway is a 529 km railway line of the China Railway in Jilin Province, connecting Changchun on the Jingha Railway with Tumen.

History
In 1917, the Chosen Government Railway's (Sentetsu) Hamgyeong Line reached Hoeryeong. Soon afterwards the Domun Railway began construction of its mainline from Hoeryeong to Donggwanjin, reaching Sambong (then called Sangsambong) in 1920, Jongseon in 1922 and finally Donggwanjin in 1924. The narrow-gauge Tiantu Railway (天圖鐵道, Chinese pinyin: Tiāntú Tiědào; Japanese: Tento Tetsudō), opened in 1923, signed a cross-border operational agreement with the Domun Railway on 26 June 1926, after which a bridge across the Tumen River between Sangsambong and Kaishantun was opened on 30 September 1927. In 1929 the Domun Railway was nationalised and absorbed by Sentetsu, and Sambong–Namyang section was renamed the North Chosen West Line (Puksŏn-sŏbusŏn, 북선서부선), and the Namyang–Unggi section was renamed North Chosen East Line (Puksŏn-tongbusŏn, 북선동부선). Connecting the Jingtu Line with the North Chosen East Line would create a short, direct route

In 1940 there were seven passenger trains between Chaoyangchuan and Sambong and eight from Sambong to Chaoyanghcuan, with a second-class ticket for the full distance costing 1 Manchukuo yuan 8 chiao 3 fen, and a third-class ticket costing 1 yuan 1 chiao. Travel time ranged from as short as 3 hours (Train 1220, leaving Sambong at 9:55 AM and arriving at Chaoyangchuan at 2:05 PM), to as long as 4 hours 5 minutes (Train 1222, leaving Sambong at 4:40 PM and arriving at Chaoyangchuan at 8:45 PM). There were also several trains over shorter relations, including Chaoyangchuan–Badaohe and Chaoyangchuan–Longjing. Two KiHa-3 class railcars were assigned to passenger services on this line.

By the time the last timetable was issued prior to the start of the Pacific War in November 1942, service on the line had been cut back to three return trips between Chaoyangchuan and Sambong - one each in the morning, afternoon, and evening. These were still operated by 3rd class railcar.