Following the absorption of the Tomun Railway by Sentetsu in 1929, on 1 October 1933 the Hoeryŏng Colliery Line, along with the rest of Sentetsu's Tomun Line to Unggi, were transferred to the South Manchuria Railway (Mantetsu).

[5] Mantetsu took over the management, operation and maintenance of these lines, until finally on 1 July 1940 it was transferred back to Sentetsu.

Coal is shipped from mines on this line to the Kim Chaek Iron & Steel Complex at Kimchaek and the Ch'ŏngjin Steel Works in Ch'ŏngjin, with the order of collection from each line arranged in the order of the total weight of the outbound cars.

[8] This line also serves the Hoeryŏng Tobacco Factory located near the former station of Yŏngsu.

A yellow background in the "Distance" box indicates that section of the line is not electrified.