The Tehosa-class (テホサ) 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

Whilst the first two classes of 4-6-0 locomotives in Korea, the Tehoi and Tehoni classes, were built by

Baldwin Baldwin is a Germanic name, composed of the elements ''bald'' "bold" and ''win'' "friend". People * Baldwin (name) Places Canada * Baldwin, York Regional Municipality, Ontario * Baldwin, Ontario, in Sudbury District * Baldwin's Mills, Qu ...

, Sentetsu turned to a different

American American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...

manufacturer for the third class - ALCo's Brooks Works built nine such locomotives for Sentetsu in 1911. Intended for long-range mixed trains, they were initially numbered 222–230, and subsequently were renumbered 651–659 in 1918. After being 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 the 1930s, they were redesignated テホサ (''Tehosa'') class and numbered テホサ1 through テホサ9 in the 1938 general renumbering. Like all Teho-type locomotives operated by Sentetsu, they had driving wheels of and a top speed of , and many were assigned to the Manpo Line in the northern part of the country. One final unit, テホサ10, was built by Gyeongseong Works in 1938.

Postwar

Korean National Railroad 터우3 (Teou3) class

The exact dispersal of the ten Tehosa-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 two went to the

, where the

designated them 터우3 (''Teou3'') class and were used primarily on branchline trains.

Korean State Railway 더우서 (Tŏusŏ) class

Having been assigned primarily to the Manpo Line, most of the class went to the North after the partition, where they were designated 더우서 (''Tŏusŏ'') class by the Korean State Railway, but little is known of their service lives and subsequent fates.

Construction

References

{{DPRKloco Locomotives of Korea Locomotives of South Korea Locomotives of North Korea Railway locomotives introduced in 1911 4-6-0 locomotives ALCO locomotives