Kumgol Line

The Kŭmgol Line (Korean: 금골선) is an electrified standard-gauge secondary line of the North KoreanState Railway running from Yŏhaejin on the P'yŏngra Line to Muhak. Located entirely in Tanch'ŏn city, South Hamgyŏng - one of the DPRK's most important mining areas - freight trains moving ore from the mines on the line to the P'yŏngra Line form the bulk of the line's traffic.

The line is in relatively severe terrain, with a ruling grade of 26‰. There are 45 bridges with a total length of 3,112 m (10,210 ft), and 30 tunnels with a total of 8,241 m (27,037 ft).