The Tehoi-class (テホイ) locomotives were a class of

steam Steam is a substance containing water in the gas phase, and sometimes also an aerosol of liquid water droplets, or air. This may occur due to evaporation or due to boiling, where heat is applied until water reaches the enthalpy of vaporization ...

tender locomotives of the Chosen Government Railway (''Sentetsu'') with

4-6-0 A 4-6-0 steam locomotive, under the Whyte notation for the classification of steam locomotives by wheel arrangement, has four leading wheels on two axles in a leading bogie and six powered and coupled driving wheels on three axles with the abse ...

wheel arrangement. The "Teho" name came from the American naming system for steam locomotives, under which locomotives with 4-6-0 wheel arrangement were called "Ten Wheeler". After the

Liberation of Korea The surrender of the Empire of Japan in World War II was announced by Emperor Hirohito on 15 August and formally signed on 2 September 1945, bringing the war's hostilities to a close. By the end of July 1945, the Imperial Japanese Navy ...

, of the 178 surviving locomotives of all Teho classes - including six previously owned by private railway companies - 106 went to the

Korean National Railroad The Korea Railroad Corporation (Korean: 한국철도공사, Hanja: ), branded as KORAIL (코레일, officially changed to in November 2019), is the national railway operator in South Korea. Currently, KORAIL is a public corporation, managed ...

in the

South South is one of the cardinal directions or Points of the compass, compass points. The direction is the opposite of north and is perpendicular to both east and west. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Pro ...

, and 72 to the Korean State Railway in the North.

Description

The テホイ (''Tehoi'') class was a class of six 4-6-0

Vauclain compound The Vauclain compound was a type of compound steam locomotive that was briefly popular circa 1900. Developed at the Baldwin Locomotive Works, it featured two pistons moving in parallel, driving a common crosshead and controlled by a common valve ...

locomotives for mainline use built by the

Baldwin Locomotive Works The Baldwin Locomotive Works (BLW) was an American manufacturer of railroad locomotives from 1825 to 1951. Originally located in Philadelphia, it moved to nearby Eddystone, Pennsylvania, in the early 20th century. The company was for decades t ...

of the United States in 1906, originally for the

Gyeongbu Railway The Gyeongbu Line (''Gyeongbuseon'') is a railway line in South Korea and is considered to be the most important and one of the oldest ones in the country. It was constructed in 1905, connecting Seoul with Busan via Suwon, Daejeon, and Daegu. ...

, and later operated by the Chosen Government Railway. Like all Teho-type locomotives operated by Sentetsu, they had driving wheels of and a top speed of .

Gyeongbu Railway 300 series

Needing more locomotives for medium-duty passenger operations on both trunk and branch lines, the Gyeongbu Railway once again turned to Baldwin of the United States, ordering a total of twelve 4-6-0 tender locomotives in 1906. Six of these were two-cylinder Vauclain compounds and the other six were single-cylinder locomotives, which were delivered in

knockdown Knockdown or knock-down may refer to: * Knockdown, a situation in full-contact combat sports where a fighter is down or vulnerable, often preliminary to a knockout * "Knockdown" (Castle), the thirteenth episode of the third season of the TV serie ...

form and assembled at the railway's shops in Busan. Numbered 301–306, they were not long in operation with the Gyeongbu Railway, as the company was nationalised in July 1906 and folded into the newly formed National Railway, which became Sentetsu in 1910, in September of that year.

Chosen Government Railway テホイ (Tehoi) class

After being taken over by Sentetsu, they were put to use on mainline passenger trains, but as more powerful types were introduced, they were gradually relegated to branchline duties and freight trains. In 1918 they were renumbered 601–606, and in 1929 they were rebuilt with

superheater A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, steam engines, and in processes such as steam reforming. There ar ...

s. In Sentetsu's general renumbering of 1938, they were designated テホイ (''Tehoi'') class and numbered テホイ1 through テホイ6.

Postwar

The exact dispersal of the six Tehoi-class locomotives after the

partition of Korea The division of Korea began with the defeat of Japan in World War II. During the war, the Allied leaders considered the question of Korea's future after Japan's surrender in the war. The leaders reached an understanding that Korea would be li ...

in 1945 and the division of Sentetsu assets in 1947 is uncertain, but at least one went to the

, where the

designated them 터우1 (''Teou1'') class. Those that went to the North were designated 더우하 (''Tŏuha'') class by the Korean State Railway.

Construction

References

{{DPRKloco Locomotives of Korea Locomotives of South Korea Locomotives of North Korea Railway locomotives introduced in 1906 4-6-0 locomotives Baldwin locomotives Vauclain compound locomotives