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US Railroad Administration Heavy Pacific
The Heavy Pacific was intended as the standard heavy express locomotive in the USRA program. It shared the cross-section of the boiler barrel with the Light Mikado and Light Mountain. It had a driver diameter of 79 in...
| US Railroad Administration Heavy PacificRemove | |
|---|---|
| Variant | Standard |
| Built | 1918 |
| Manufacturers | ALCO;Baldwin |
| Wheel arrangement | 2C1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 138799 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | US Railroad Administration Heavy Pacific Standard Remove |
|---|---|
| Built | 1918 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | US Railroad Administration Heavy Pacific Standard Remove |
|---|---|
| Wheelbase | 11.02 m |
| Service mass | 138.8 t |
| Adhesion mass | 89.4 t |
| Total mass | 226.9 t |
| Rigid wheelbase | 4.27 m |
| Axle load | 27.2 t |
| Water capacity | 30,283 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | US Railroad Administration Heavy Pacific Standard Remove |
|---|---|
| Grate area | 6.578 m² |
| Firebox surface | 30.379 m² |
| Tube heating surface | 324.882 m² |
| Evaporative heating surface | 355.262 m² |
| Superheater surface | 82.405 m² |
| Total heating surface | 437.7 m² |
Power plant
| Property | US Railroad Administration Heavy Pacific Standard Remove |
|---|---|
| Driver diameter | 2,007 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 711 mm |
Power
| Property | US Railroad Administration Heavy Pacific Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,312 kW (3,143 PS) |
| Starting effort | 195.4 kN |
Calculated values
| Property | US Railroad Administration Heavy Pacific Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.49 |
| Optimal speed | 72 km/h |
| Power-to-weight ratio | 16.7 kW/t |
| Heating Surface Equivalent | 672.0 m² |
| Cylinder volume/HSE | 1 : 781.91 |
| Adhesive weight/Total | 1 : 1.55 |
| Tractive force/Heating surface | 1 : 9.32 |
| Grate area/Heating surface | 1 : 66.53 |
| Firebox/Tube surface | 1 : 10.69 |
| Total/Superheater | 1 : 4.31 |
