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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 Chesapeake & Ohio |
|---|---|
| Built | 1918 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | US Railroad Administration Heavy Mountain Chesapeake & Ohio |
|---|---|
| Wheelbase | 12.19 m |
| Rigid wheelbase | 5.56 m |
| Total wheelbase | 23.08 m |
| Service weight | 159.9 t |
| Adhesive weight | 110.2 t |
| Axle load | 27.6 t |
| Total weight | 248 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | US Railroad Administration Heavy Mountain Chesapeake & Ohio |
|---|---|
| Grate area | 7.089 m² |
| Firebox surface | 34.653 m² |
| Tube heating surface | 398.833 m² |
| Evaporative heating surface | 433.486 m² |
| Superheater surface | 100.8 m² |
| Total heating surface | 534.3 m² |
Power plant
| Property | US Railroad Administration Heavy Mountain Chesapeake & Ohio |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 762 mm |
Power
| Property | US Railroad Administration Heavy Mountain Chesapeake & Ohio |
|---|---|
| Power source | steam |
| Estimated power | 2,535 kW (3,447 PS) |
| Starting effort | 257.8 kN |
Calculated values
| Property | US Railroad Administration Heavy Mountain Chesapeake & Ohio |
|---|---|
| Factor of adhesion | 1 : 4.19 |
| Optimal speed | 60 km/h |
| Power-to-weight ratio | 15.9 kW/t |
| Heating Surface Equivalent | 808.4 m² |
| Cylinder volume/HSE | 1 : 748.96 |
| Adhesive weight/Total | 1 : 1.45 |
| Tractive force/Heating surface | 1 : 10.08 |
| Grate area/Heating surface | 1 : 75.37 |
| Firebox/Tube surface | 1 : 11.51 |
| Total/Superheater | 1 : 4.30 |
