咸北線
The Musan Line is an electrified standard-gauge secondary trunk line of the Korean State Railway in Musan and Puryŏng counties, North Hamgyŏng Province, North Korea, running from Komusan on the Hambuk Line to Musan, where it connects to the narrow-gauge Paengmu Line. The section from Komusan to Sinch'am is double tracked.