Sentetsu Tehoko-class locomotive

The Tehoko-class (テホコ) 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]

Chosen Government Railway Tehoko class (テホコ)
Korean National Railroad Teou5 class (터우5)
Korean State Railway Tŏuo class (더우오)
A wrecked Sentetsu Tehoko-class locomotive in 1945.
Type and origin
Power typeSteam
BuilderALCo, Shahekou Works
Build date1917–1919
Total produced36
Specifications
Configuration:
​
 • Whyte4-6-0
Gauge1,435 mm (4 ft 8 1⁄2 in)
Driver dia.1,680 mm (66 in)
Length17,972 mm (58 ft 11.6 in)
Width2,997 mm (9 ft 10.0 in)
Height4,232 mm (13 ft 10.6 in)
Loco weight72.52 t (71.37 long tons)
Tender weight43.45 t (42.76 long tons)
Fuel capacity6.00 t (5.91 long tons)
Water cap15,100 L (4,000 US gal)
Firebox:
 • Firegrate area		3.73 m2 (40.1 sq ft)
Boiler:
​
 • Small tubes167 x 51 mm (2.0 in)
 • Large tubes20 x 137 mm (5.4 in)
Boiler pressure12.6 kgf/cm2 (179 psi)
Heating surface175.50 m2 (1,889.1 sq ft)
 • Tubes161.90 m2 (1,742.7 sq ft)
 • Firebox12.00 m2 (129.2 sq ft)
Superheater:
​
 • Heating area38.60 m2 (415.5 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: テホコ
KNR: 터우5
KSR: 더우오
Number in class36
NumbersSentetsu: テホコ1–テホコ36
Delivered1917–1919

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

The first large class of 4-6-0 locomotives delivered to Sentetsu was the テホコ (Tehoko) class, which were express locomotives equipped with automatic injectors and other improvements, and which were much larger than the previous Teho classes.[1] The first nine, originally numbered 271–279, were built by ALCo's Schenectady Works in 1917,[4] followed by six copies, numbered 280–285, built in the same year by the South Manchuria Railway's Shahekou Works;[1] Another twelve followed in 1918 from ALCO's Pittsburgh plant, numbered 295–306.[1] Like all Teho-type locomotives operated by Sentetsu, they had driving wheels of 1,680 mm (66 in) and a top speed of 95 km/h (59 mph),[1] and were initially used as mainline passenger power on the Gyeongbu Line; they were later relegated to branchline duties.[5] In the 1938 general renumbering they became テホコ1 through テホコ36.[4] The 27 locomotives on the roster at the time of the 1918 renumbering became 701–727 in that year;[4] the last nine, delivered in 1918–19 from Shahekou, were numbered 728–736. In Sentetsu's general renumbering of 1938 the class was designated テホコ (Tehoko) class, and the locomotives were renumbered テホコ1 through テホコ38.[1]

Postwar

Korean National Railroad 터우5 (Teou5) 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 seven went to the South,[4] where the Korean National Railroad designated them 터우5 (Teou5) class [1] and used them until April 1955, when they were replaced by diesel locomotives.[5]

The only surviving Teho type locomotive in South Korea is 터우5-700, on display on a plinth at the entrance of Korail's Human Resources Department. Sentetsu held a commemoration of the 10th anniversary of the re-establishment of the Railway Bureau in Yongsan in 1935, and built 터우5-700 for display there. It was built as a cutaway displaying the internal structure of the locomotive, and it was equipped with a motor to move the driving wheels, which in turn shows the operation of the locomotive's moving parts. After use as a display item it was moved to the Railway University in Yongsan, where it was used as an instructional tool for students, until subsequently being relocated once again to its current location for preservation as part of Korea's railway cultural heritage.[5]

Korean State Railway 더우오 (Tŏuo) class

Most of the class went to the North after the partition, where they were designated 더우오 (Tŏuo) class by the Korean State Railway, but little is known of their service lives and subsequent fates.

Construction
Sentetsu running numberPostwar
Original1918–19381938–1945OwnerNumberBuilderYearNotes
271テホ701テホコ1??ALCo-Schenectady1917
272テホ702テホコ2??ALCo-Schenectady1917
273テホ703テホコ3??ALCo-Schenectady1917
274テホ704テホコ4??ALCo-Schenectady1917
275テホ705テホコ5??ALCo-Schenectady1917
276テホ706テホコ6??ALCo-Schenectady1917
277テホ707テホコ7??ALCo-Schenectady1917
278テホ708テホコ8??ALCo-Schenectady1917
279テホ709テホコ9??ALCo-Schenectady1917
280テホ710テホコ10KNR터우5-10Shahekou1917
281テホ711テホコ11??Shahekou1917
282テホ712テホコ12??Shahekou1917
283テホ713テホコ13KNR터우5-13Shahekou1917
284テホ714テホコ14??Shahekou1917
285テホ715テホコ15??Shahekou1917
295テホ716テホコ16??ALCo-Pittsburgh1918
296テホ717テホコ17KNR터우5-17ALCo-Pittsburgh1918
297テホ718テホコ18??ALCo-Pittsburgh1918
298テホ719テホコ19KNR터우5-19ALCo-Pittsburgh1918
299テホ720テホコ20KNR터우5-20ALCo-Pittsburgh1918
300テホ721テホコ21??ALCo-Pittsburgh1918
301テホ722テホコ22??ALCo-Pittsburgh1918
302テホ723テホコ23??ALCo-Pittsburgh1918
303テホ724テホコ24??ALCo-Pittsburgh1918
304テホ725テホコ25??ALCo-Pittsburgh1918
305テホ726テホコ26??ALCo-Pittsburgh1918
306テホ727テホコ27??ALCo-Pittsburgh1918
-テホ728テホコ28KNR터우5-28Shahekou1918–19
-テホ729テホコ29??Shahekou1918–19
-テホ730テホコ30??Shahekou1918–19
-テホ731テホコ31??Shahekou1918–19
-テホ732テホコ32??Shahekou1918–19
-テホ733テホコ33KNR터우5-33Shahekou1918–19
-テホ734テホコ34??Shahekou1918–19
-テホ735テホコ35??Shahekou1918–19
-テホ736テホコ36??Shahekou1918–19
Total36

References
  1. 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. "Korean National RR Class TW5 4-6-0s". donsdepot.donrossgroup.net.
  5. "철또군이 들려주는 이야기 : 네이버 블로그" Check |url= value (help). korail0918.blog.me.
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