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JNR's steam locomotive D50 class

D50.jpg / 11.8KBytes
D50 140 Nov.2005 Umekoji Steam Locomotives Museum
To cope with the increased freight traffic in the 1920s onward, more powerful locomotives than the type 9600 were required, so the type D50 was made, 380 of them built, between 1923 and 1931 by Kisha-Seizo, Kawasaki, Hitachi, and Nippon-Sharyo. Originally called the type 9900, it was formally renamed the type D50 in 1928. It was used for main line freight transportation in various regions all over Japan. Of these type 9900s, 1 was modified and offered to the North China Transportation Company in the Japanese-occupied Chinese mainland. After the war, it became the type Mika-16 in the People's Republic of China, and it became the type JF16 in 1953, but as of 1955 it was no longer used. Because of its heavy body, this locomotive was moved to local lines while the D51 and D52 were used as the main steam locomotive types for freight service. In addition, 78 were converted to the type D60 to lighten the axle weight. The last was used until 1971, and 2 of them are currently in static preservation (refers to locomotives that are preserved in a way that does not allow them to be immediately operated, and/or that are simply on display).

Data of D50 class
Whell arrangement 2-8-2 Heating Surface(m2) 222.30
Loco. Weight in Working Order(t) 78.14 Loading Capacity of Water(m3) 17.0
Weight on Driving Wheels(t) 58.79 Loading Capacity of Coal(t) 12.0
Tender Weight in Working Order(t) 49.0 Height of Boiler Cube center(mm) 2,500
Max Axle Weight(t) 14.9 Length(mm) 20,030
Diameter of Driving Wheel(mm) 1,400 Height(mm) 3,955
Cylinder Dimensions(mm) 570X660 Length of Locomotive(mm) 11,928
Boiler Pressure(kg/cm2) 13.00 Length of Tender(mm) 7,340
Grate Area(m2) 3.25 Gauge 1,067mm(3'6")

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