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Boston & Maine classes P-1 and P-2
The Boston & Maine's first Pacifics were 82 members of the classes P-1 and P-2. They were characterized by 73 inch (1,854 mm) drivers and cylinders which were sized 22 by 28 inches. The P-1 consisted of twelve saturat...
General
| Property | Boston & Maine classes P-1 and P-2 P-2 |
|---|---|
| Built | 1911-1916 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Boston & Maine classes P-1 and P-2 P-2 |
|---|---|
| Wheelbase | 10.21 m |
| Rigid wheelbase | 3.96 m |
| Total wheelbase | 19.36 m |
| Service weight | 113.1 t |
| Adhesive weight | 71.6 t |
| Axle load | 25.1 t |
| Total weight | 185.3 t |
| Water capacity | 32,933 l |
| Fuel capacity | 21.8 t (coal) |
Boiler
| Property | Boston & Maine classes P-1 and P-2 P-2 |
|---|---|
| Grate area | 4.97 m² |
| Firebox surface | 25.363 m² |
| Tube heating surface | 259.478 m² |
| Evaporative heating surface | 284.841 m² |
| Superheater surface | 76.459 m² |
| Total heating surface | 361.3 m² |
Power plant
| Property | Boston & Maine classes P-1 and P-2 P-2 |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 559 x 711 mm |
Power
| Property | Boston & Maine classes P-1 and P-2 P-2 |
|---|---|
| Power source | steam |
| Estimated power | 1,715 kW (2,332 PS) |
| Starting effort | 140.4 kN |
Calculated values
| Property | Boston & Maine classes P-1 and P-2 P-2 |
|---|---|
| Factor of adhesion | 1 : 5.00 |
| Optimal speed | 74 km/h |
| Power-to-weight ratio | 15.2 kW/t |
| Heating Surface Equivalent | 564.6 m² |
| Cylinder volume/HSE | 1 : 617.88 |
| Adhesive weight/Total | 1 : 1.58 |
| Tractive force/Heating surface | 1 : 8.11 |
| Grate area/Heating surface | 1 : 72.70 |
| Firebox/Tube surface | 1 : 10.23 |
| Total/Superheater | 1 : 3.73 |
