The Changyŏn Line is a non-electrified standard-gauge secondary line of the Korean State Railway running from Sugyo on the Ŭnnyul Line to Changyŏn, South Hwanghae Province, North Korea.

[1] This line was originally opened on 21 January 1937 as part of the Chosen Railway's 762 mm (30.0 in) narrow gauge Hwanghae Line network,[2] as an extension to the Sariwŏn—Sanghae (renamed Samgang after nationalisation)—Sugyo line.

[3] After the end of the Pacific War, the Changyŏn Line ended up in North Korea as a result of the subsequent partition of Korea.

After the end of the Korean War the Railway Ministry of the DPRK began to expand and improve its network, including in South Hwanghae, leading to the opening of a line from Sugyo to Ch'ŏlgwang in 1961.

[1] A yellow background in the "Distance" box indicates that section of the line is not electrified.