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. 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, 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.

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. The first nine, originally numbered 271–279, were built by ALCo's Schenectady Works in 1917, followed by six copies, numbered 280–285, built in the same year by the South Manchuria Railway's Shahekou Works; Another twelve followed in 1918 from ALCO's Pittsburgh plant, numbered 295–306. Like all Teho-type locomotives operated by Sentetsu, they had driving wheels of and a top speed of , and were initially used as mainline passenger power on the Gyeongbu Line; they were later relegated to branchline duties. In the 1938 general renumbering they became テホコ1 through テホコ36. The 27 locomotives on the roster at the time of the 1918 renumbering became 701–727 in that year; 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.

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, where the Korean National Railroad designated them 터우5 (Teou5) class and used them until April 1955, when they were replaced by diesel locomotives.

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.

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 number Postwar Original 1918–1938 1938–1945 Owner Number Builder Year Notes 271 テホ701 テホコ1 ? ? ALCo-Schenectady 1917 272 テホ702 テホコ2 ? ? ALCo-Schenectady 1917 273 テホ703 テホコ3 ? ? ALCo-Schenectady 1917 274 テホ704 テホコ4 ? ? ALCo-Schenectady 1917 275 テホ705 テホコ5 ? ? ALCo-Schenectady 1917 276 テホ706 テホコ6 ? ? ALCo-Schenectady 1917 277 テホ707 テホコ7 ? ? ALCo-Schenectady 1917 278 テホ708 テホコ8 ? ? ALCo-Schenectady 1917 279 テホ709 テホコ9 ? ? ALCo-Schenectady 1917 280 テホ710 テホコ10 KNR 터우5-10 Shahekou 1917 281 テホ711 テホコ11 ? ? Shahekou 1917 282 テホ712 テホコ12 ? ? Shahekou 1917 283 テホ713 テホコ13 KNR 터우5-13 Shahekou 1917 284 テホ714 テホコ14 ? ? Shahekou 1917 285 テホ715 テホコ15 ? ? Shahekou 1917 295 テホ716 テホコ16 ? ? ALCo-Pittsburgh 1918 296 テホ717 テホコ17 KNR 터우5-17 ALCo-Pittsburgh 1918 297 テホ718 テホコ18 ? ? ALCo-Pittsburgh 1918 298 テホ719 テホコ19 KNR 터우5-19 ALCo-Pittsburgh 1918 299 テホ720 テホコ20 KNR 터우5-20 ALCo-Pittsburgh 1918 300 テホ721 テホコ21 ? ? ALCo-Pittsburgh 1918 301 テホ722 テホコ22 ? ? ALCo-Pittsburgh 1918 302 テホ723 テホコ23 ? ? ALCo-Pittsburgh 1918 303 テホ724 テホコ24 ? ? ALCo-Pittsburgh 1918 304 テホ725 テホコ25 ? ? ALCo-Pittsburgh 1918 305 テホ726 テホコ26 ? ? ALCo-Pittsburgh 1918 306 テホ727 テホコ27 ? ? ALCo-Pittsburgh 1918 - テホ728 テホコ28 KNR 터우5-28 Shahekou 1918–19 - テホ729 テホコ29 ? ? Shahekou 1918–19 - テホ730 テホコ30 ? ? Shahekou 1918–19 - テホ731 テホコ31 ? ? Shahekou 1918–19 - テホ732 テホコ32 ? ? Shahekou 1918–19 - テホ733 テホコ33 KNR 터우5-33 Shahekou 1918–19 - テホ734 テホコ34 ? ? Shahekou 1918–19 - テホ735 テホコ35 ? ? Shahekou 1918–19 - テホ736 テホコ36 ? ? Shahekou 1918–19 Total 36

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