The Tomon Railway Company (Japanese: 図們鉄道株式会社, Tomon Tetsudo Kabushiki Kaisha; Korean: 도문철도주식회사; RR: Domun Cheoldo Jusikhoesa), was a privately owned railway company in Korea, Empire of Japan.

[1] The narrow-gauge Tiantu Railway, opened in 1923,[2] signed a cross-border operational agreement with the Tomon Railway on 26 June 1926,[3] after which a bridge across the Tumen River between Jōsanpō and Kaishantun was opened on 30 September 1927.

[2] After the end of the Pacific War, the Provisional People’s Committee for North Korea nationalised all railways in the Soviet zone of occupation on 10 August 1946, and following the establishment of North Korea, the Korean State Railway was created.

[6] After the end of the Korean War, the restructuring of the North Korean railway system, including the rearrangement of rail lines, led to the Hoeryeong–Sambong line becoming part of the Korean State Railway's Hambuk Line running from Cheongjin to Rajin via Namyang.

[7] Little is known about the Domun Railway's motive power; however, it is known that four 2-6-2T tank locomotives operated by the Domun Railway became Sentetsu's Pureko- and Purero-class locomotives after nationalisation of the company.