Sohaeri Line

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 new narrow-gauge line from Sugyo to Ch'ŏlgwang in 1963.[2] With the opening of the new line, the Sariwŏn—Sugyo—Ch'ŏlgwang line was named Ŭnnyul Line, leaving the Changyŏn Line as just the short branch from Sugyo to Changyŏn.

In 1964, another new narrow-gauge line was opened from Ch'ŏlgwang, to serve the iron ore mines around Sŏhaeri and the port at Ryongjŏng. This 10.1 km (6.3 mi) line was the Sŏhaeri Line.[3]

In 1971, a new standard gauge line was opened from Ŭnp'a on the former Sahae Line to Chaeryŏng, and at the same time, the Chaeryŏng—Sinch'ŏn—Sugyo section was converted to standard gauge.[2] The opening of the new standard gauge line from Ŭnp'a to Chaeryŏng led to the closure of the narrow gauge Sariwŏn—Chaeryŏng line.[4] The regauging of the rest of the line from Sugyo to Ch'ŏlgwang was completed in 1973,[2] but the Sŏhaeri Line was left as a narrow-gauge line.

At its peak the line carried 6,000 tonnes of ore daily. Besides the frequent trains to stations, there were 12 daily round trips to the port, each train consisting of 21 self-unloading hoppers. The line has been out of use since 2002.[3]

The orange background in the "Distance" box indicates that section of the line is not electrified narrow-gauge.