The Changjin Line () is an electrified narrow gauge line of the North Korean State Railway running from Yà Ânggwang on the Sinhà Âng Line to Sasu on Lake Changjin. There is a cable-hauled section between Samgo and Hwangch'oryong; between Pojang and Hwangch'oryong the grade reaches 370â°.
In 1923 the privately owned Sinhà Âng Railway opened the mainline of its Hamnam Line (not to be confused with the line of the same name of the Chosen Magnesite Development Railway, nowadays called Kà Âmgol Line), from Hamhà Âng to Sinhà Âng via Oro (nowadays called Yà Ânggwang), and subsequently expanded the line with the addition of a branch from Oro to Sangt'ong that was opened on 1 October 1926.
In 1934, to aid in the construction of a new hydroelectric power plant on the Changjin River, and to exploit forestry and other resources in the area, the Sinhà Âng Railway began opening its Changjin Line. The first section, from Sangt'ong to Samgà Â, was opened on 1 September 1934, followed by an extension from Samgà  to Kujin on 1 November of the same year. Later, the SindaeâÂÂKujin section was closed on 15 July 1935, followed by the closure of the SasuâÂÂSindae section on 30 August 1935.
The Sinhà Âng Railway was bought and absorbed by the Chosen Railway on 22 April 1938.
Following the establishment of the DPRK, all railways in North Korea were nationalised, becoming part of the Korean State Railway. The Chosen Railway's Hamnam, Songhà Âng and Changjin Lines were split up, with the mainline of the Hamnam Line and the Songhà Âng Line merged to become the Sinhà Âng Line, while the Yà ÂnggwangâÂÂSang'tong branch was split off from the Hamnam Line and added to the Changjin Line, and the line was later electrified. Although the Hamhà ÂngâÂÂSinhà Âng section was rebuilt to standard gauge by the Korean State Railway, the Changjin Line remained narrow gauge.
Although significant for passenger transport in the area, the bulk of the trains on the Changjin Line are for freight transport, with the majority of traffic being outbound cargo - in the mid 1980s, 62.1% of all freight traffic originated on the line for shipment elsewhere, while only 37.9% being traffic from elsewhere destined for points on the line. Wood accounts for the vast majority of outbound freight - up to 78.8% in the 1980s, with grain, ore and metals being the other major commodities. Of inbound goods, coal is the most important at 36.7% of the total (of which up to 20% is anthracite), followed by rice and other grains (18.9%), fertiliser (11.9%), sea products (8.2%) and cement (4.2%).
A yellow background in the "Distance" box indicates that section of the line is not electrified; a pink background indicates that section is narrow gauge; an orange background indicates that section is non-electrified narrow gauge.