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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...
| Baltimore & Ohio class P-7Remove | |
|---|---|
| Variant | rebuilt P-7b, c |
| Built | 1943 |
| Manufacturers | Mount Clare |
| Wheel arrangement | 2C1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 150593 kg |
| Top speed | 137 km/h |
| Power | |
| Engine |
General
| Property | Baltimore & Ohio class P-7rebuilt P-7b, c |
|---|---|
| Built | 1943 |
| Manufacturers | Mount Clare |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Baltimore & Ohio class P-7rebuilt P-7b, c |
|---|---|
| Wheelbase | 11.30 m |
| Service mass | 150.6 t |
| Adhesion mass | 92.5 t |
| Total mass | 249.5 t |
| Rigid wheelbase | 4.27 m |
| Axle load | 31.3 t |
| Water capacity | 41,640 l |
| Fuel capacity | 15.4 t (coal) |
Boiler
| Property | Baltimore & Ohio class P-7rebuilt P-7b, c |
|---|---|
| Grate area | 6.531 m² |
| Firebox surface | 35.21 m² |
| Tube heating surface | 303.236 m² |
| Evaporative heating surface | 338.446 m² |
| Superheater surface | 84.356 m² |
| Total heating surface | 422.8 m² |
Power plant
| Property | Baltimore & Ohio class P-7rebuilt P-7b, c |
|---|---|
| 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-7rebuilt P-7b, c |
|---|---|
| Power source | steam |
| Estimated power | 2,722 kW (3,701 PS) |
| Top speed | 137 km/h |
| Starting effort | 221.9 kN |
Calculated values
| Property | Baltimore & Ohio class P-7rebuilt P-7b, c |
|---|---|
| Factor of adhesion | 1 : 4.09 |
| Optimal speed | 76 km/h |
| Power-to-weight ratio | 18.1 kW/t |
| Heating Surface Equivalent | 683.2 m² |
| Cylinder volume/HSE | 1 : 769.05 |
| Adhesive weight/Total | 1 : 1.63 |
| Tractive force/Heating surface | 1 : 10.96 |
| Grate area/Heating surface | 1 : 64.74 |
| Firebox/Tube surface | 1 : 8.61 |
| Total/Superheater | 1 : 4.01 |
