The Sinhŭng Line is an electrified 762 mm (2 ft 6 in) narrow gauge railway line of the Korean State Railway in South Hamgyŏng Province, North Korea, running from Hamhŭng (Hamhŭng-si) to Pujŏnhoban (Pujŏn-gun) on Lake Pujŏn via Sinhŭng (Sinhŭng-gun).

[1] Though primarily an industrial railway connecting to the Pujŏn River hydroelectric power plant, it also plays an important role in passenger transportation in the region.

[2] During the Japanese colonial era, the privately owned Sinhŭng Railway built a network of narrow-gauge lines north of Hamhŭng.

Goods arriving onto the line from elsewhere include coal (anthracite and bituminous), fertiliser, aquatic products, grains and cement.

[2] Though primarily an industrial railway connecting to the Pujŏn River hydroelectric power plant, it also plays an important role in passenger transportation in the region.