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Baltimore & Ohio class P-7
In 1927, the B&O put a total of 20 members of the P-7 class into service, which at the time were the most powerful Pacifics ever. The power was achieved with a driver diameter of 80 inches and cylinders measuring 27 b...
General
| Property | Baltimore & Ohio class P-7 P-7a |
|---|---|
| Built | 1937 |
| Manufacturers | Mount Clare |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Baltimore & Ohio class P-7 P-7a |
|---|---|
| Wheelbase | 11.30 m |
| Rigid wheelbase | 4.27 m |
| Service weight | 154.2 t |
| Adhesive weight | 93.9 t |
| Axle load | 31.8 t |
| Total weight | 262.9 t |
| Water capacity | 49,210 l |
| Fuel capacity | 17.7 t (coal) |
Boiler
| Property | Baltimore & Ohio class P-7 P-7a |
|---|---|
| Grate area | 6.531 m² |
| Firebox surface | 39.855 m² |
| Tube heating surface | 320.33 m² |
| Evaporative heating surface | 360.185 m² |
| Superheater surface | 86.586 m² |
| Total heating surface | 446.8 m² |
Power plant
| Property | Baltimore & Ohio class P-7 P-7a |
|---|---|
| Driver diameter | 2,032 mm |
| Boiler pressure | 15.9 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 711 mm |
Power
| Property | Baltimore & Ohio class P-7 P-7a |
|---|---|
| Power source | steam |
| Estimated power | 2,834 kW (3,853 PS) |
| Top speed | 137 km/h |
| Starting effort | 221.9 kN |
Calculated values
| Property | Baltimore & Ohio class P-7 P-7a |
|---|---|
| Factor of adhesion | 1 : 4.15 |
| Optimal speed | 79 km/h |
| Power-to-weight ratio | 18.4 kW/t |
| Heating Surface Equivalent | 732.6 m² |
| Cylinder volume/HSE | 1 : 717.17 |
| Adhesive weight/Total | 1 : 1.64 |
| Tractive force/Heating surface | 1 : 10.37 |
| Grate area/Heating surface | 1 : 68.41 |
| Firebox/Tube surface | 1 : 8.04 |
| Total/Superheater | 1 : 4.16 |
