The Jangjin Line (長津線, Chōshin-sen) was a 762 mm (2 ft 6.0 in) narrow gauge railway line of the Chōsen Railway of colonial-era Korea, located in South Hamgyeong Province.

[1] There is a 7.4 km (4.6 mi) cable-hauled section between Samgo and Hwangch'oryong; between Pojang and Hwangch'oryong the grade reaches 370‰.

[2] In 1934, to aid in the construction of a new hydroelectric power plant on the Jangjin River, and to exploit forestry and other resources in the area, the Sinheung Railway, a subsidiary of the Chōsen Railway began construction of a new line from Sangtong, terminus of its Hamnam Line.

After the partition of Korea, the line was located in the territory of North Korea, and was nationalised to become part of the Korean State Railway.

[1] In the November 1942 timetable, the last issued prior to the start of the Pacific War, Chōtetsu operated the following schedule of third-class-only local passenger services:[8]