The Yangsi Line was a non-electrified standard-gauge railway line of the Korean State Railway in North P'yà Ângan Province, North Korea, running from Namsi (Yà Âmju) on the P'yà Ângà Âi Line to South Sinà Âiju, likewise on the P'yà Ângà Âi Line, with which it was merged in 1964.
The privately owned Tasado Railway opened a line from South Sinà Âiju interlocking on the Kyà Ângà Âi Line of Chosen Government Railway (Sentetsu) to Tasado Port via Yangsi, called the Tasado Line, on 31 October 1939, to provide the Oji Paper Company (today the Sinuiju Chemical Fibre Complex) of Sinà Âiju a means of shipping its products out via the port at Tasado, as the Yalu River freezes in winter. Then, on 29 October 1940 the Tasado Railway opened a second line, called the Yangsi Line, from Yangsi to Namsi, likewise on Sentetsu's Kyà Ângà Âi Line, to make a southern connection with the mainline to P'yà Ângyang and Kyà Ângsà Âng. On 1 April 1943, Sentetsu nationalised the SinuijuâÂÂYangsi section of the line, both Sentetsu's new line, as well as the Tasado Railway's truncated line, kept the "Yangsi Line" name; the Tasado Line was thus shortened to its present-day condition.
After the partition of Korea the line was within the territory of the DPRK, and was nationalised by the Provisional PeopleâÂÂs Committee for North Korea along with all other railways in the Soviet zone of occupation on 10 August 1946, to create the Korean State Railway (Kukch'à Âl); at that time, Sentetsu's and the Tasado Railway's sections of the Yangsi Line were re-merged, to return the line to its original route from South Sinà Âiju to Namsi. Since the distance between South Sinà Âiju and Namsi via the Yangsi Line was nearly shorter than via the original routing of the P'yà Ângà Âi Line via Paengma, Kukch'à Âl decided to rearrange the lines; thus, the Yangsi Line was made part of the P'yà Ângà Âi Line, and the original South Sinà ÂijuâÂÂPaengmaâÂÂYangsi section was separated to become the Paengma Line in 1964. Electrification of the former Yangsi Line was completed in the same year. Yangsi and Namsi stations were given their current names, Ryongch'à Ân and Yà Âmju respectively, sometime after 1964.