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US Railroad Administration Light Mountain
The USRA Light Mountain was planned as a light standard freight locomotive and had a boiler slightly larger than that of the Heavy Pacific or the Heavy Mikado . It was almost 20,000 pounds lighter than the Heavy Mount...
General
| Property | US Railroad Administration Light MountainRemove |
|---|---|
| Built | 1918 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | US Railroad Administration Light MountainRemove |
|---|---|
| Wheelbase | 12.19 m |
| Rigid wheelbase | 5.56 m |
| Total wheelbase | 23.08 m |
| Service weight | 148.3 t |
| Adhesive weight | 101.8 t |
| Axle load | 25.6 t |
| Total weight | 236.2 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | US Railroad Administration Light MountainRemove |
|---|---|
| Grate area | 6.531 m² |
| Firebox surface | 32.33 m² |
| Tube heating surface | 350.524 m² |
| Evaporative heating surface | 382.854 m² |
| Superheater surface | 89.744 m² |
| Total heating surface | 472.6 m² |
Power plant
| Property | US Railroad Administration Light MountainRemove |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 762 mm |
Power
| Property | US Railroad Administration Light MountainRemove |
|---|---|
| Power source | steam |
| Estimated power | 2,424 kW (3,296 PS) |
| Starting effort | 239.7 kN |
Calculated values
| Property | US Railroad Administration Light MountainRemove |
|---|---|
| Factor of adhesion | 1 : 4.17 |
| Optimal speed | 61 km/h |
| Power-to-weight ratio | 16.3 kW/t |
| Heating Surface Equivalent | 724.0 m² |
| Cylinder volume/HSE | 1 : 777.56 |
| Adhesive weight/Total | 1 : 1.46 |
| Tractive force/Heating surface | 1 : 10.59 |
| Grate area/Heating surface | 1 : 72.36 |
| Firebox/Tube surface | 1 : 10.84 |
| Total/Superheater | 1 : 4.27 |
