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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...
| US Railroad Administration Heavy MountainRemove | |
|---|---|
| Variant | Norfolk & Western K-2a |
| Built | 1919 |
| Manufacturers | ALCO;Baldwin |
| Wheel arrangement | 2D1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 163049 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | US Railroad Administration Heavy MountainNorfolk & Western K-2a |
|---|---|
| Built | 1919 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | US Railroad Administration Heavy MountainNorfolk & Western K-2a |
|---|---|
| Wheelbase | 12.19 m |
| Total wheelbase | 23.08 m |
| Service mass | 163 t |
| Adhesion mass | 112.6 t |
| Total mass | 334.8 t |
| Rigid wheelbase | 5.56 m |
| Axle load | 28.1 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | US Railroad Administration Heavy MountainNorfolk & 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 MountainNorfolk & 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 MountainNorfolk & 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 MountainNorfolk & 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 |
