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Northern Pacific classes W-3 and W-5
The class W-3 was created in 1913 as an enlarged successor to the W class. It was fitted with a superheater from the start and, from the second batch, also with a combustion chamber . This made it possible to increase...
| Northern Pacific classes W-3 and W-5Remove | |
|---|---|
| Variant | |
| Built | 1913, 1917-1920 |
| Manufacturers | ALCO |
| Wheel arrangement | 1D1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 145150 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Northern Pacific classes W-3 and W-5Remove |
|---|---|
| Built | 1913, 1917-1920 |
| Manufacturers | ALCO |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Northern Pacific classes W-3 and W-5Remove |
|---|---|
| Wheelbase | 10.74 m |
| Total wheelbase | 20.78 m |
| Service mass | 145.2 t |
| Adhesion mass | 109.1 t |
| Total mass | 233.1 t |
| Rigid wheelbase | 5.03 m |
| Axle load | 29.2 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Northern Pacific classes W-3 and W-5Remove |
|---|---|
| Grate area | 6.54 m² |
| Firebox surface | 30.194 m² |
| Tube heating surface | 303.422 m² |
| Evaporative heating surface | 333.615 m² |
| Superheater surface | 78.596 m² |
| Total heating surface | 412.2 m² |
Power plant
| Property | Northern Pacific classes W-3 and W-5Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 762 mm |
Power
| Property | Northern Pacific classes W-3 and W-5Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,013 kW (2,737 PS) |
| Starting effort | 254.1 kN |
Calculated values
| Property | Northern Pacific classes W-3 and W-5Remove |
|---|---|
| Factor of adhesion | 1 : 4.21 |
| Optimal speed | 48 km/h |
| Power-to-weight ratio | 13.9 kW/t |
| Heating Surface Equivalent | 641.8 m² |
| Cylinder volume/HSE | 1 : 943.35 |
| Adhesive weight/Total | 1 : 1.33 |
| Tractive force/Heating surface | 1 : 12.87 |
| Grate area/Heating surface | 1 : 63.03 |
| Firebox/Tube surface | 1 : 10.05 |
| Total/Superheater | 1 : 4.24 |
