Built by the Baldwin Locomotive Works of the United States in 1894, the ソリイ (Sorii) class locomotives were bought second-hand by the Imperial Japanese Army for use by the Temporary Military Railway in Korea.[1] In 1906, the Temporary Military Railway was taken over the Government-General of Korea to create the National Railway, which became Sentetsu in 1910. First numbered 101–106, they became numbers 1001–1006 in 1918, and finally in Sentetsu's 1938 general renumbering, they were given the numbers ソリイ1 through ソリイ6.[3]
Postwar: Korean National Railroad 소리1 (Sori1) class