A new standard gauge section from Paeg'am to Taet'aek, roughly paralleling the narrow-gauge line, was built in 2013.

[3] Although not part of that 12-year plan, it was decided to build the Paengmu Line for the transport of forest products and to aid in the development of the area.

The plans were revived again in the mid-2000s, and work began on the second stage, in the form of the shortening and regauging of the Samjiyŏn Line from Hyesan to Motka.

[15] Construction of the reservoir of the Paektusan Sŏngun Youth Power Station led to the flooding of part of the line,[2] resulting in the closure of the section between Ch'ŏnsu and Kulsong; since the closure, the line is electrified only between Paeg'am and Kulsong.

Construction of the line took place as follows: An orange background in the "Distance" box indicates that section of the line is not electrified narrow-gauge; a pink background indicates that section is electrified narrow gauge.