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Specifications
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

Type and origin
Type and origin
Power type	Steam
Builder	Brooks Locomotive Works
Build date	1899
Total produced	4

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)
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.
Power type
Type and origin
Power type	Steam
Builder	Brooks Locomotive Works
Build date	1899
Total produced	4
Configuration:;
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
Maximum speed
Performance figures
Maximum speed	55 km/h (34 mph)
Tractive effort	53.4 kN (12,000 lbf)
Operators
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?

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 Incheon—Noryangjin line.^[1]

Description

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]

Gallery

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.

References

^ ^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.
^ 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.
^ "North and South Korea Steam Locomotives". 20 April 2004. Archived from the original on 20 April 2004.{{cite web}}: CS1 maint: bot: original URL status unknown (link)