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Japanese Government Railways class D51
The D51 was a class of Mikado locomotives built for the rising freight volumes in the thirties. It was a more powerful successor of the D50 and was designed by Hideo Shima. It was lighter than the D50 due to the exten...
| Japanese Government Railways class D51Remove | |
|---|---|
| Variant | Standard |
| Built | 1936-1951 |
| Manufacturers | Kawasaki;Kisha Seizo;Hitachi;Nippon Sharyō;Mitsubishi |
| Wheel arrangement | 1D1 |
| Gauge | 1067;1435 mm |
| Length | 19730 mm |
| Service mass | 78370 kg |
| Top speed | 85 km/h |
| Power | |
| Engine |
General
| Property | Japanese Government Railways class D51 Standard Remove |
|---|---|
| Built | 1936-1951 |
| Manufacturers | Kawasaki, Kisha Seizo, Hitachi, Nippon Sharyō, Mitsubishi |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,067 mm; 1,435 mm |
Dimensions and weights
| Property | Japanese Government Railways class D51 Standard Remove |
|---|---|
| Length | 19.73 m |
| Service mass | 78.4 t |
| Total mass | 125.8 t |
| Axle load | 14.3 t |
| Water capacity | 20,000 l |
| Fuel capacity | 8 t (coal) |
Boiler
| Property | Japanese Government Railways class D51 Standard Remove |
|---|---|
| Grate area | 3.27 m² |
| Firebox surface | 17.5 m² |
| Tube heating surface | 147.4 m² |
| Evaporative heating surface | 164.9 m² |
| Superheater surface | 41.4 m² |
| Total heating surface | 206.3 m² |
Power plant
| Property | Japanese Government Railways class D51 Standard Remove |
|---|---|
| Driver diameter | 1,400 mm |
| Boiler pressure | 15 bar |
| Expansion type | simple expansion |
| Cylinders | two, 550 x 660 mm |
Power
| Property | Japanese Government Railways class D51 Standard Remove |
|---|---|
| Power source | steam |
| Indicated power | 1,030 kW (1,400 PS) |
| Top speed | 85 km/h |
| Starting effort | 181.8 kN |
Calculated values
| Property | Japanese Government Railways class D51 Standard Remove |
|---|---|
| Optimal speed | 35 km/h |
| Power-to-weight ratio | 13.1 kW/t |
| Heating Surface Equivalent | 335.2 m² |
| Cylinder volume/HSE | 1 : 935.59 |
| Tractive force/Heating surface | 1 : 18.41 |
| Grate area/Heating surface | 1 : 63.09 |
| Firebox/Tube surface | 1 : 8.42 |
| Total/Superheater | 1 : 3.98 |
