[6] In order to facilitate the transport of ironstone from the Musan Mining Complex, the 33.6 km section between Sinch'am and Komusan was double-tracked, and electrification of the line was completed in 1977.

[2] Freight traffic on the Musan Line is 7.5 times greater in the eastbound (Musan-Komusan) direction than the reverse.

94.2% of the freight moved towards Komusan is magnetite ore from the Musan Mining Complex; timber accounts for 4.3%.

From Komusan to Musan coal forms the majority of freight, along with other necessities - grain, fertiliser, cement etc.

A large portion of westbound trains consist of empty cars bound for the mines at Musan.