China Railways JF21 (解放21)
Type and origin Power type Steam Builder ALCo Build date 1937
Specifications Configuration: ​  • Whyte 2-8-2 Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 1,370 mm (4 ft 6 in) Length 20,975 mm (68 ft 9.8 in) Total weight 135.66 t (133.52 long tons)
Career Operators Yuehan Railway Central China Railway China Railway Class CR: ㄇㄎ21 (1951−1959) CR: 解放21 (1959–end)

The China Railways JF21 (解放21, Jiěfàng, "liberation") class steam locomotive was a class of 2-8-2 steam locomotives operated by the China Railway, built by the American Locomotive Company in the United States in 1937.^{[citation needed]}

These locomotives were originally built for the Yuehan Railway,^{[citation needed]} and after the establishment of the Japanese puppet government of the Reformed Government of the Republic of China, they were operated by the Central China Railway, which had been created in 1939 to manage all railway operations in the territory of the collaborationist government by nationalising all privately owned railways in the territory.^[1]

After the end of the Pacific War, these locomotives were passed on to the Republic of China Railway. After the establishment of the People's Republic of China, China Railways designated them ㄇㄎ21 (MK21) class in 1951, and they were retired in 1955.^{[citation needed]}