[1] The ruling grade on the line is 12‰ and the minimum curve radius is 300 m (980 ft).

[2] The Tŏkhyŏn Line was opened by the Korean State Railway in April 1971.

[2] The primary function of the Tŏkhyŏn Line is to deliver iron ore from the mines around Tŏkhyŏn to the September Iron & Steel Complex (9월제철종합기업소) in Sinŭiju and the Hwanghae Iron & Steel Complex on the Songrim Line, thus the bulk of southbound freight is ore from the mines.

[2] Three pairs of commuter trains run on the line between Sinŭiju Ch'ŏngnyŏn and Tŏkhyŏn stations.

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