Hambuk Line
The Hambuk Line is an electrified standard-gauge trunk line of the Korean State Railway in North Korea, running from Ch'ŏngjin) on the P'yŏngra Line to Rajin, likewise on the P'yŏngra line.

The Hambuk line connects to the Hongŭi Line at Hongŭi, which is North Korea's only rail connection to Russia, and at Namyang to the Namyang Border Line, which leads to Tumen, China, via the bridge over the Tumen River.

Although located entirely inside North Hamgyŏng Province, this line is one of the DPRK's main trunk railways. The line's total length is ; in terms of length, it is the second-longest rail line in the country after the P'yŏngra Line, accounting for 7.7% of the national total of railway lines.

Over ten rail lines - secondary mainlines and branchlines - connect to the Hambuk Line, including the Musan Line, the Hoeryŏng Colliery Line, the Kogŏnwŏn Line, the Hoeam Line, and the Hongŭi Line, along with numerous branchlines. The Hambuk Line connects three cities and four counties - Ch'ŏngjin City, Puryŏng County, Hoeryŏng City, Onsŏng County, Kyŏngwŏn County, Kyŏnghŭng County, and the Rason Special City.

In terms of regional characteristics, the Hambuk Line passes through two largely distinct areas. It runs inland in mountainous terrain between Panjuk to Hoeryŏng, then along the Tumen River and the northern border of the country all the way to Rajin. The steepest part of the line is between Puryŏng and Ch'angp'yŏng, where the ruling gradient is over 20‰. Conversely, the route on the Tumen River's bank along the national border is comparatively flat.

There is double track from Susŏng, where the line connects to the Kangdŏk line, to Komusan, where the Musan line begins; the dual-gauge section (standard and Russian gauges) from Hongŭi to Rajin is also double-tracked.

There are service facilities for locomotives in Hoeryŏng and Sambong and for rolling stock in Namyang.
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Hambuk Line
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Hambuk Line
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Hambuk Line
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Hambuk Line
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