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Buffalo, Rochester & Pittsburgh class XX
The 2-8-8-2 Mallets built by ALCO-Brooks in 1918 for the BR&P were among the heaviest locomotives in the world when they were built. They had drivers of 57 inches and cylinder diameters of 28 and 44 inches, with a str...
| Buffalo, Rochester & Pittsburgh class XXRemove | |
|---|---|
| Variant | |
| Built | 1918 |
| Manufacturers | ALCO |
| Wheel arrangement | (1D)D1 ma |
| Gauge | 1435 mm |
| Length | 31175 mm |
| Service mass | 258094 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Buffalo, Rochester & Pittsburgh class XXRemove |
|---|---|
| Built | 1918 |
| Manufacturers | ALCO |
| Wheel arrangement | 2-8-8-2 (Mikado Mallet) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Buffalo, Rochester & Pittsburgh class XXRemove |
|---|---|
| Length | 31.18 m |
| Wheelbase | 17.50 m |
| Total wheelbase | 27.86 m |
| Service mass | 258.1 t |
| Adhesion mass | 226.8 t |
| Total mass | 351.4 t |
| Rigid wheelbase | 4.72 m |
| Water capacity | 45,425 l |
| Fuel capacity | 12.7 t (coal) |
Boiler
| Property | Buffalo, Rochester & Pittsburgh class XXRemove |
|---|---|
| Grate area | 9.216 m² |
| Firebox surface | 44.501 m² |
| Tube heating surface | 572.562 m² |
| Evaporative heating surface | 617.063 m² |
| Superheater surface | 151.618 m² |
| Total heating surface | 768.7 m² |
Power plant
| Property | Buffalo, Rochester & Pittsburgh class XXRemove |
|---|---|
| Driver diameter | 1,448 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | compound |
| Cylinders | four, HP: 711 x 813 mm and LP: 1,118 x 813 mm |
Power
| Property | Buffalo, Rochester & Pittsburgh class XXRemove |
|---|---|
| Power source | steam |
| Estimated power | 2,535 kW (3,447 PS) |
| Starting effort | 473.8 kN |
| Starting effort simple | 568.5 kN |
Calculated values
| Property | Buffalo, Rochester & Pittsburgh class XXRemove |
|---|---|
| Factor of adhesion | 1 : 3.91 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 9.8 kW/t |
| Heating Surface Equivalent | 1,142.8 m² |
| Cylinder volume/HSE | 1 : 1,262.80 |
| Adhesive weight/Total | 1 : 1.14 |
| Tractive force/Heating surface | 1 : 15.45 |
| Grate area/Heating surface | 1 : 83.41 |
| Firebox/Tube surface | 1 : 12.87 |
| Total/Superheater | 1 : 4.07 |
