The Koch'am T'an'gwang Line, or Koch'am Colliery Line, is an electrified 4 kilometers long freight-only railway line of the Korean State Railway in North Hamgyŏng Province, North Korea, from Myŏngch'ŏn on the P'yŏngra Line to Sinmyŏngch'ŏn and the Myŏngch'ŏn Coal Complex.