Sentetsu Mikasa-class locomotive

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Chosen Government Railway Mikasa class (ミカサ) West Chosen Central Railway Mikasa class (ミカサ) Korean National Railroad Mika3 class (미카3) Korean State Railway Migasŏ class (미가서) Central China Railway Mikasa class (ミカサ) China Railways JF9 (解放9)
Builder's photo of Sentetsu locomotive ミカサ97
Type and origin Power type Steam Builder Kisha Seizō, Nippon Sharyō, Hitachi, Kawasaki, Gyeongseong Works Build date 1927–1946 Total produced 398
Specifications Configuration: ​  • Whyte 2-8-2 Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 1,450 mm (57.09 in) Length 22,035 mm (867.5 in) Width 3,078 mm (10 ft 1.2 in) Height 4,507 mm (14 ft 9.4 in) Loco weight 90.65 t (89.22 long tons) Tender weight 65.80 t (64.76 long tons) Fuel capacity 11.0 t (10.8 long tons) (1st) 12.0 t (11.8 long tons) Water cap. 22.7 m3 (6,000 US gal) (1st) 28.0 m3 (7,400 US gal) Firebox: ​  • Grate area 4.75 m2 (51.1 sq ft) Boiler: ​  • Small tubes 118 x 51 mm (2.0 in)  • Large tubes 28 x 137 mm (5.4 in) Boiler pressure 13.0 kgf/cm2 (185 psi) Heating surface: ​  • Firebox 21.70 m2 (233.6 sq ft)  • Tubes 153.40 m2 (1,651.2 sq ft)  • Total surface 175.10 m2 (1,884.8 sq ft) Superheater: ​  • Heating area 61.50 m2 (662.0 sq ft) Cylinders 2 Cylinder size 580 mm × 710 mm (22.835 in × 27.953 in) Valve gear Walschaerts
Performance figures Maximum speed 70 km/h (43 mph) Tractive effort 179.0 kN (40,200 lbf)
Career Operators Chosen Government Railway West Chosen Central Railway Korean National Railroad Korean State Railway Central China Railway China Railway Class Sentetsu, WCCR, CCR: ミカサ KNR: 미카3 KSR: 미가서 CR: ㄇㄎ玖 (1950–1959); JF9 (解放9) (1959–) Number in class Sentetsu: 308 WCCR: 8 KNR: at least 54 KSR: at least 9 CCR/CR: 38 Numbers Sentetsu: ミカサ1–ミカサ297, ミカサ303–ミカサ313 WCCR: ミカサ201–ミカサ208 KNR: see text KSR: 63xx (see text) CCR: ミカサ11–ミカサ19, ミカサ110–ミカサ137, ミカサ320 CR: JF9 3671–3710 Delivered 1927–1946

The Mikasa-class (ミカサ) locomotives were a group of steam tender locomotives of the Chosen Government Railway (Sentetsu) with 2-8-2 wheel arrangement. The "Mika" name came from the American naming system for steam locomotives, under which locomotives with 2-8-2 wheel arrangement were called "Mikado" in honour of the Emperor of Japan, as the first 2-8-2 locomotives in the world were built for Japan.

Of all Mika classes, 131 went to the Korean National Railroad in South Korea and 292 to the Korean State Railway in North Korea.^[1] Of these 423 locomotives, 356 were from Sentetsu; the other 67 were South Manchuria Railway Mikai-class engines on loan to Sentetsu along with Mika-type locomotives which had previously belonged to the twelve privately owned railways in Korea before 1945. Not included in this number, however, are the six SMR Mikai-class locomotives that were assigned to SMR's Rajin depot for operation on SMR's lines in northeastern Korea, and the eight SMR Mikaro-class locomotives likewise assigned to the Rajin depot; these fourteen locomotives were taken over by the Korean State Railway. Despite the DPRK government's extensive anti-Japanese propaganda, the railway nevertheless continues to use the "Mika" name officially for these locomotives even though it refers to the Japanese emperor.^[2]

The Mikasa class was also operated by the Central China Railway in Japanese-occupied China,^[2] and by the China Railway after the fall of China to communism, where they were designated JF9 class.