Sentetsu Tehoro-class locomotive

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Chosen Government Railway Tehoro class (テホロ)
Korean National Railroad Teou6 class (터우6)
Korean State Railway Tŏuyu class (더우유)
Sentetsu Tehoro.png
A Tehoro-class locomotive as built.
Type and origin
Power typeSteam
Builder, Kawasaki, Hitachi Kasato, Mitsubishi
Build date1927–1942
Total produced95
Specifications
Configuration:
​
 • Whyte4-6-0
Gauge1,435 mm (4 ft 8+1⁄2 in)
Driver dia.1,680 mm (66 in)
Length18,424 mm (60 ft 5.4 in)
Width3,050 mm (10 ft 0 in)
Height4,232 mm (13 ft 10.6 in)
Loco weight75.10 t (73.91 long tons) to
77.20 t (75.98 long tons)
Tender weight48.50 t (47.73 long tons) to
54.00 t (53.15 long tons)
Fuel capacity7.6 t (7.5 long tons) to
9.5 t (9.3 long tons)
Water cap.17,500 L (4,600 US gal) to
20,000 L (5,300 US gal)
Firebox:
 • Firegrate area		4.36 m2 (46.9 sq ft)
Boiler:
​
 • Small tubes150 x 51 mm (2.0 in)
 • Large tubes24 x 137 mm (5.4 in)
Boiler pressure12.6 kgf/cm2 (179 psi)
Heating surface170.80 m2 (1,838.5 sq ft)
 • Tubes157.20 m2 (1,692.1 sq ft)
 • Firebox12.00 m2 (129.2 sq ft)
Superheater:
​
 • Heating area46.30 m2 (498.4 sq ft)
Cylinders1
Cylinder size530 mm × 660 mm (21 in × 26 in)
Valve gearWalschaerts
Performance figures
Maximum speed95 km/h (59 mph)
Tractive effort120.0 kN (27,000 lbf)
Career
OperatorsChosen Government Railway
Korean National Railroad
Korean State Railway
ClassSentetsu: テホロ
KNR: 터우6
KSR: 더우유
Number in class95
NumbersSentetsu: テホロ1–テホロ95
Delivered1927–1942

The Tehoro-class (テホロ) locomotives were a class of steam tender locomotives of the Chosen Government Railway (Sentetsu) with 4-6-0 wheel arrangement.[1] 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".[2]

After the Liberation of Korea, of the 178 surviving locomotives of all Teho classes - including six previously owned by private railway companies - 106 went to the Korean National Railroad in the South, and 72 to the Korean State Railway in the North.[3]

Description[]

Having become indispensable on branchline use, it was decided to modernise the Teho type, and in 1925–26 local engineers developed a derivative locomotive.[1] 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 .[4] 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.[1] The next thirteen came in 1929, five from Gyeongseong and four each from Mitsubishi and Hitachi's Kasato works;[1][4] the last of these became the largest producer of Tehoro class locomotives.[1] Another eighteen were delivered in 1937, nine each from Hitachi Kasato and Kawasaki,[1] 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.[4] Finally, between 1939 and 1941, 56 more were delivered, mostly from Hitachi Kasato.[1]

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.[1]

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,[4] where the Korean National Railroad designated them 터우6 (Teou6) class [1] and used them until April 1955, when they were replaced by diesel locomotives.[5]

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.[4]
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:[1]
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[]

  1. ^ a b c d e f g h i j Byeon, Seong-u (1999). 한국철도차량 100년사 [Korean Railways Rolling Stock Centennial] (in Korean). Seoul: Korea Rolling Stock Technical Corp.
  2. ^ Colvin, Fred H. (1906). The railroad pocket-book: a quick reference cyclopedia of railroad information. New York, Derry-Collard; London, Locomotive Publishing Company (US-UK co-edition). p. L‑9.
  3. ^ "Korean National RR TW-1 4-6-0". donsdepot.donrossgroup.net.
  4. ^ a b c d e "Korean National RR Class TW6 4-6-0s". donsdepot.donrossgroup.net.
  5. ^ "철또군이 들려주는 이야기 : 네이버 블로그". korail0918.blog.me.
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