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US Railroad Administration Light Pacific
While the USRA Heavy Pacific was designed for express trains, the Light Pacific had a six inch smaller driver diameter and was primarily intended for passenger trains. With a maximum axle load of 54,000 pounds, it was...
General
| Property | US Railroad Administration Light PacificRemove |
|---|---|
| Built | 1919-1920 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | US Railroad Administration Light PacificRemove |
|---|---|
| Wheelbase | 10.59 m |
| Rigid wheelbase | 3.96 m |
| Service weight | 125.6 t |
| Adhesive weight | 73.5 t |
| Axle load | 24.5 t |
| Total weight | 213.6 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | US Railroad Administration Light PacificRemove |
|---|---|
| Grate area | 6.197 m² |
| Firebox surface | 24.248 m² |
| Tube heating surface | 285.398 m² |
| Evaporative heating surface | 309.646 m² |
| Superheater surface | 73.765 m² |
| Total heating surface | 383.4 m² |
Power plant
| Property | US Railroad Administration Light PacificRemove |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 635 x 711 mm |
Power
| Property | US Railroad Administration Light PacificRemove |
|---|---|
| Power source | steam |
| Estimated power | 1,976 kW (2,687 PS) |
| Starting effort | 181.3 kN |
Calculated values
| Property | US Railroad Administration Light PacificRemove |
|---|---|
| Factor of adhesion | 1 : 3.98 |
| Optimal speed | 66 km/h |
| Power-to-weight ratio | 15.7 kW/t |
| Heating Surface Equivalent | 578.4 m² |
| Cylinder volume/HSE | 1 : 778.79 |
| Adhesive weight/Total | 1 : 1.71 |
| Tractive force/Heating surface | 1 : 9.87 |
| Grate area/Heating surface | 1 : 61.87 |
| Firebox/Tube surface | 1 : 11.77 |
| Total/Superheater | 1 : 4.20 |
