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US Railroad Administration Heavy Mountain
One of the USRA standard types intended for lighter, fast freight trains was the Heavy Mountain. Compared to the Light Mountain, it had the same wheel diameter and boiler pressure, but a cylinder diameter increased by...
General
| Property | US Railroad Administration Heavy Mountain Norfolk & Western K-2a |
|---|---|
| Built | 1919 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | US Railroad Administration Heavy Mountain Norfolk & Western K-2a |
|---|---|
| Wheelbase | 12.19 m |
| Rigid wheelbase | 5.56 m |
| Total wheelbase | 23.08 m |
| Service weight | 163 t |
| Adhesive weight | 112.6 t |
| Axle load | 28.1 t |
| Total weight | 334.8 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | US Railroad Administration Heavy Mountain Norfolk & Western K-2a |
|---|---|
| Grate area | 7.089 m² |
| Firebox surface | 34.281 m² |
| Tube heating surface | 380.996 m² |
| Evaporative heating surface | 415.277 m² |
| Superheater surface | 100.8 m² |
| Total heating surface | 516.1 m² |
Power plant
| Property | US Railroad Administration Heavy Mountain Norfolk & Western K-2a |
|---|---|
| Driver diameter | 1,778 mm |
| Boiler pressure | 15.2 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 762 mm |
Power
| Property | US Railroad Administration Heavy Mountain Norfolk & Western K-2a |
|---|---|
| Power source | steam |
| Estimated power | 2,629 kW (3,574 PS) |
| Starting effort | 279.5 kN |
Calculated values
| Property | US Railroad Administration Heavy Mountain Norfolk & Western K-2a |
|---|---|
| Factor of adhesion | 1 : 3.95 |
| Optimal speed | 58 km/h |
| Power-to-weight ratio | 16.1 kW/t |
| Heating Surface Equivalent | 788.3 m² |
| Cylinder volume/HSE | 1 : 768.03 |
| Adhesive weight/Total | 1 : 1.45 |
| Tractive force/Heating surface | 1 : 11.31 |
| Grate area/Heating surface | 1 : 72.80 |
| Firebox/Tube surface | 1 : 11.11 |
| Total/Superheater | 1 : 4.12 |
