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)
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 type Steam Builder Brooks Locomotive Works Build date 1899 Total produced 4
Specifications Configuration: ​  • Whyte 2-6-0 Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 1,070 mm (42 in) Length 9,132 mm (359.5 in) Width 2,642 mm (104.0 in) Height 3,405 mm (134.1 in) Axle load est. 5 t (4.9 long tons) Adhesive weight 29.45 t (28.98 long tons) Loco weight 34.3 t (33.8 long tons) Fuel type Coal Fuel capacity 1.36 t (1.34 long tons) Water cap. 3.63 m3 (960 US gal) Firebox: ​  • Grate area 1.21 m2 (13.0 sq ft) Boiler: ​  • Small tubes 122 x 51 mm (2.0 in) Boiler pressure 10.0 kgf/cm2 (142 psi) Heating surface: ​  • Firebox 6.6 m2 (71 sq ft)  • Tubes 52.6 m2 (566 sq ft)  • Total surface 59.2 m2 (637 sq ft) Cylinders 2 Cylinder size 350 mm × 560 mm (14 in × 22 in) Valve gear Stephenson
Performance figures Maximum speed 55 km/h (34 mph) Tractive effort 53.4 kN (12,000 lbf)
Career Operators Gyeongin Railway (1899–1903) Gyeongbu Railway (1903–1906) Chosen Government Railway (1906–1945) Korean National Railroad (1945–) Korean State Railway (1945–) Class Sentetsu: モガイ KNR: 모가1 KSR: 모가하 Number in class 4 Numbers Gyeongin/Gyeongbu: 1–4 Sentetsu: モガイ1–モガイ4 Delivered 17 June 1899 Withdrawn 1930s?

TheMogai class (モガイ) was a class of steam tank locomotives of theChosen Government Railway (Sentetsu) with 2-6-0wheel arrangement.^[1] The "Moga" name came from theAmerican 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 inKorea, introduced by theGyeongin Railway in 1899 for use on theIncheon—Noryangjin 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 theGyeongin Railway - by theBrooks Locomotive Works in theUnited States, and were shipped to Korea disassembled and assembled atIncheon on 17 June 1899.^[1] Numbered 1–4, they were originally built withbuffers-and-chain couplers, but these were replaced withJanney couplers around 1904–1905. The Gyeongin Railway was acquired by theGyeongbu 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 theSentetsu 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 betweenNorth andSouth Korea, with three going to theKorean National Railroad in the South and one to theKorean State Railway in the North.^[3]

• 
  Blueprint of the Mogai class locomotive
• 
  Gyeongin Railway number 2 (better quality)
• 
  Mogai class locomotive in Korea in 1906. Note the buffers-and-chain coupler.
• 
  The picture shows the modernized old Korea. King 'Kojong' believed that the new western technology such as electricity, streetcars, gold mining, and railroads could made the nation wealthy and strong. The location is probably at the outskirts of Seoul, where the new tramcar was installed in 1899.
• 
  Moga class locomotive number 104 of the Chosen Government Railway around 1906.

• Locomotives of Korea under Japanese rule
• Locomotives of North Korea
• Steam locomotives of South Korea
• Scrapped locomotives
• Railway locomotives introduced in 1899
• 2-6-0T locomotives
• 1′C n2t locomotives
• Brooks locomotives
• Locomotives of Korea

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