Japanese National Railways class D60
Japan 1951 78 produced
In order to reduce the axle load of the trailing axle of the D50 class with a 2-8-2 wheel arrangement, a two-axle bogie was installed in its place from 1951. Along with other modifications, the D60 class was created. The D51 class was converted into the D61 class and the D52 class into the D62 class in the same way. In addition, the cylinder diameter had been reduced from 570 to 550 mm to reduce the tendency to slip. The locomotives were retired between 1966 and 1974. Four have survived to this day.
Technical data
General
- Built
- 1951-1956
- Manufacturers
- Hamamatsu
- Wheel arrangement
- 2-8-4 (Berkshire)
- Gauge
- 1,067 mm (Cape gauge)
Dimensions and weights
- Length
- 20.03 m
- Wheelbase
- 10.25 m
- Total wheelbase
- 17.27 m
- Service mass
- 81.6 t
- Adhesion mass
- 54.7 t
- Total mass
- 130.6 t
- Rigid wheelbase
- 4.71 m
- Axle load
- 13.7 t
- Water capacity
- 17,000 l
- Fuel capacity
- 12 t (coal)
Boiler
- Grate area
- 3.25 m²
- Firebox surface
- 15.2 m²
- Tube heating surface
- 121.9 m²
- Evaporative heating surface
- 137.1 m²
- Superheater surface
- 75.2 m²
- Total heating surface
- 212.3 m²
Power plant
- Driver diameter
- 1,400 mm
- Boiler pressure
- 12.8 bar
- Expansion type
- simple expansion
- Cylinders
- two, 550 x 660 mm
Power
- Power source
- steam
- Estimated power
- 1,050 kW (1,428 PS)
- Top speed
- 70 km/h
- Starting effort
- 155.2 kN
Calculated values
- Factor of adhesion
- 1 : 3.46
- Optimal speed
- 42 km/h
- Power-to-weight ratio
- 12.9 kW/t
- Heating Surface Equivalent
- 363.5 m²
- Cylinder volume/HSE
- 1 : 862.75
- Adhesive weight/Total
- 1 : 1.49
- Tractive force/Heating surface
- 1 : 15.26
- Grate area/Heating surface
- 1 : 65.32
- Firebox/Tube surface
- 1 : 8.02
- Total/Superheater
- 1 : 1.82
