Sentetsu Mogai-class locomotive

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Chosen Government Railway Mogai class (モガイ)
Gyeongin Railway 1–4
Gyeongbu Railway 100 series
Korean National Railroad Moga1 class (모가1)
Korean State Railway Mogaha class (모가하)
S&CRR 2 - 1899.jpg
Gyeongin Railway number 2 as built in 1899 by Brooks.
Note the "S. & C. R.R. Seoul–Chemulpo" lettering, which was removed soon after delivery.
Type and origin
Power typeSteam
BuilderBrooks Locomotive Works
Build date1899
Total produced4
 • Whyte2-6-0
Gauge1,435 mm (4 ft 8 12 in)
Driver dia.1,070 mm (42 in)
Length9,132 mm (359.5 in)
Width2,642 mm (104.0 in)
Height3,405 mm (134.1 in)
Axle loadest. 5 t (4.9 long tons)
Adhesive weight29.45 t (28.98 long tons)
Loco weight34.3 t (33.8 long tons)
Fuel typeCoal
Fuel capacity1.36 t (1.34 long tons)
Water cap3.63 m3 (960 US gal)
 • Firegrate area
1.21 m2 (13.0 sq ft)
 • Small tubes122 x 51 mm (2.0 in)
Boiler pressure10.0 kgf/cm2 (142 psi)
Heating surface59.2 m2 (637 sq ft)
 • Tubes52.6 m2 (566 sq ft)
 • Firebox6.6 m2 (71 sq ft)
Cylinder size350 mm × 560 mm (14 in × 22 in)
Valve gearStephenson
Performance figures
Maximum speed55 km/h (34 mph)
Tractive effort53.4 kN (12,000 lbf)
OperatorsGyeongin Railway (1899–1903)
Gyeongbu Railway (1903–1906)
Chosen Government Railway (1906–1945)
Korean National Railroad (1945–)
Korean State Railway (1945–)
ClassSentetsu: モガイ
KNR: 모가1
KSR: 모가하
Number in class4
NumbersGyeongin/Gyeongbu: 1–4
Sentetsu: モガイ1–モガイ4
Delivered17 June 1899

The Mogai class (モガイ) was a class of steam tank locomotives of the Chosen Government Railway (Sentetsu) with 2-6-0 wheel arrangement.[1] The "Moga" name came from the American naming system for steam locomotives, under which locomotives with 2-6-0 wheel arrangement were called "Mogul".[2] The Moga class was the first type of steam locomotive in Korea, introduced by the Gyeongin Railway in 1899 for use on the IncheonNoryangjin line.[1]


The Mogai-class locomotives were tank locomotives with one leading axle and three powered axles, carrying water and coal without a tender. The axle load is estimated to have been around 5 tons per axle. It was quickly found insufficient, and no further locomotives of the same wheel arrangement were introduced.[1]

Four 2-6-0T tank locomotives were built for the Seoul & Chemulpo Railway - the English name of the Gyeongin Railway - by the Brooks Locomotive Works in the United States, and were shipped to Korea disassembled and assembled at Incheon on 17 June 1899.[1] Numbered 1–4, they were originally built with buffers-and-chain couplers, but these were replaced with Janney couplers around 1904–1905. The Gyeongin Railway was acquired by the Gyeongbu Railway in 1903, which renumbered them 101–104; they were later transferred to Sentetsu after the nationalisation of the Gyeongbu Railway in 1906, and were used as general purpose locomotives until eventually being replaced by the Sentetsu Pure class locomotives.[1] In 1918 they were designated モガ (Moga) class by Sentetsu, retaining their Gyeongbu Railway numbers as モガ101 – モガ194, and Sentetsu's 1938 reclassification became モガイ (Mogai) class モガイ1 through モガイ4.

Although said to have been retired in the 1930s,[1] they were nevertheless accounted for in the 1947 division of Sentetsu assets between North and South Korea, with three going to the Korean National Railroad in the South and one to the Korean State Railway in the North.[3]



  1. ^ a b c d e f 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. ^ "North and South Korea Steam Locomotives". 20 April 2004. Archived from the original on 20 April 2004.CS1 maint: BOT: original-url status unknown (link)