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JNR's steam locomotive B20 class

B20 10 Nov. 2005 Umekoji Steam Locomotives Museum
This type is one of several locomotive types designed according to a number of standards in order to quickly produce locomotives for wartime transportation. From 1944 to 1947, 15 of them were manufactured at the Japan National Railways (JNR) Koriyama factory and at Tateyama Heavy Industries. Designed during wartime when supplies were scarce, the locomotive used substitute materials and simplified manufacturing methods, making it the only JNR saturated steam locomotive (The steam evaporated in the boiler is sent directly to the cylinder. In contrast, heated steam locomotives use a superheater tube to further increase the pressure of the generated steam. They were introduced after the Taisho era). It could not operate on the main line but was used for switching within the rail yard until 1972. Currently, at the Kyoto Railway Museum, there is 1 in dynamic preservation (refers to locomotives that have been preserved in a ready-to-operate state, and/or are still running today) and 1 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 B20 class
Whell arrangement 0-4-0 Grate Area(m2) 0.81
Loco. Weight in Working Order(t) 20.3 Heating Surface(m2) 35.86
Weight on Driving Wheels(t) 20.3 Loading Capacity of Water(m3) 2.5
Max Axle Weight(t) 10.86 Loading Capacity of Coal(t) 0.9
Diameter of Driving Wheel(mm) 860 Height of Boiler Cube center(mm) 2,000
Cylinder Dimensions(mm) 300X400 Length(mm) 7,000
Boiler Pressure(kg/cm2) 13.00 Height(mm) 3,150
Gauge 1,067mm(3'6")

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