Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
4-6-0 steam locomotive
Chosen Government Railway Tehoro class (テホロ) Korean National Railroad Teou6 class (터우6) Korean State Railway Tŏuyu class (더우유)
Having become indispensable on branchline use, it was decided to modernise the Teho type, and in 1925–26 local engineers developed a derivative locomotive. The result was the テホロ (Tehoro) class, the first of which was built in July 1927 and the second in October of the same year, both at Sentetsu's Gyeongseong Works. These featured a single-stage compressor, and improvements included the expansion of the heat transfer area, improved power transfer and brakes, an automated smoke box door, and other improvements. The Tehoro class was designed for use on both passenger and freight trains, and was used primarily on the Gyeongui and Gyeongbu lines. The next thirteen came in 1929, five from Gyeongseong and four each from Mitsubishi and Hitachi's Kasato works; the last of these became the largest producer of Tehoro class locomotives. Another eighteen were delivered in 1937, nine each from Hitachi Kasato and Kawasaki, and in 1938, as part of Sentetsu's general renumbering, the Tehoro class locomotives in service received numbers テホロ1 through テホロ39. Finally, between 1939 and 1941, 56 more were delivered, mostly from Hitachi Kasato.
The Tehoro class was a notable milestone in the history of Korea's railways. As the first type designed and produced entirely by domestic (Korean and Japanese) factories, it gave Japanese and Korean designers extensive experience which was subsequently applied to the development of the Pashishi and Mikasa-class locomotives.
Postwar
Korean National Railroad 터우6 (Teou6) class
The exact dispersal of the Tehoko-class locomotives after the partition of Korea in 1945 and the division of Sentetsu assets in 1947 is uncertain, but at least five went to the South, where the Korean National Railroad designated them 터우6 (Teou6) class and used them until April 1955, when they were replaced by diesel locomotives.
Known KNR 터우6-class locomotives
Number
Last Sentetsu number
Builder
Year
Notes
터우6-23
テホロ23
Hitachi Kasato
1937
터우6-25
テホロ25
Hitachi Kasato
1937
Derelict by 1954.
터우6-32
テホロ32
Kawasaki
1937
터우6-82
テホロ83
Hitachi Kasato
1942
터우6-93
テホロ93
Hitachi Kasato
1942
Korean State Railway 더우유 (Tŏuyu) class
Most of the class went to the North after the partition, where they were designated 더우유 (Tŏuyu) class by the Korean State Railway, but little is known of their service lives and subsequent fates.
Construction
Year
Builder
Total
Numbers (1927–1938)
Numbers (1938–1945)
1927 July
Gyeongseong
1
751
テホロ1
1927 Oct.
Gyeongseong
1
752
テホロ2
1929 Mar.-Dec.
Gyeongseong
5
759–763
テホロ9–テホロ13
1929
Hitachi Kasato Mitsubishi
4 4
764–771
テホロ14–テホロ21
1937
Hitachi Kasato Kawasaki
9 9
772–789
テホロ22–テホロ39
1939
Hitachi Kasato
15
-
テホロ40–テホロ54
1940
Hitachi Kasato
10
-
テホロ55–テホロ64
1941
Hitachi Kasato Kawasaki
14 3
-
テホロ65–テホロ81
1942
Hitachi Kasato
14
-
テホロ82–テホロ95
Total
95
Tehoro production totals by manufacturer:
Builder
Years
Total
Gyeongseong
1927, 1929
7
Kawasaki
1927, 1937, 1941
18
Hitachi Kasato
1929, 1937, 1939–42
66
Mitsubishi
1929
4
Total
95
References
^ Byeon, Seong-u (1999). 한국철도차량 100년사 [Korean Railways Rolling Stock Centennial] (in Korean). Seoul: Korea Rolling Stock Technical Corp.
A Tehoro-class locomotive as built.
Chosen Government Railway locomotives and rolling stock
Rolling stock of Korail
Korean State Railway locomotives and rolling stock