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Boston & Maine class P-4
The last ten Pacifics that the Boston & Maine purchased were also the last Pacifics that Lima manufactured. Their task was regional traffic over distances of up to around 200 miles , and they were designed for an aver...
| Boston & Maine class P-4Remove | |
|---|---|
| Variant | Standard |
| Built | 1934, 1937 |
| Manufacturers | Lima |
| Wheel arrangement | 2C1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 153859 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Boston & Maine class P-4 Standard Remove |
|---|---|
| Built | 1934, 1937 |
| Manufacturers | Lima |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Boston & Maine class P-4 Standard Remove |
|---|---|
| Wheelbase | 11.25 m |
| Total wheelbase | 23.65 m |
| Service mass | 153.9 t |
| Adhesion mass | 95 t |
| Total mass | 263.1 t |
| Rigid wheelbase | 4.27 m |
| Axle load | 31.3 t |
| Water capacity | 45,425 l |
| Fuel capacity | 16.8 t (coal) |
Boiler
| Property | Boston & Maine class P-4 Standard Remove |
|---|---|
| Grate area | 6.215 m² |
| Firebox surface | 29.729 m² |
| Tube heating surface | 327.762 m² |
| Evaporative heating surface | 357.491 m² |
| Superheater surface | 89.744 m² |
| Total heating surface | 447.2 m² |
Power plant
| Property | Boston & Maine class P-4 Standard Remove |
|---|---|
| Driver diameter | 2,032 mm |
| Boiler pressure | 17.9 bar |
| Expansion type | simple expansion |
| Cylinders | two, 584 x 711 mm |
Power
| Property | Boston & Maine class P-4 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,685 kW (3,651 PS) |
| Starting effort | 182.0 kN |
Calculated values
| Property | Boston & Maine class P-4 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 5.12 |
| Optimal speed | 90 km/h |
| Power-to-weight ratio | 17.5 kW/t |
| Heating Surface Equivalent | 685.6 m² |
| Cylinder volume/HSE | 1 : 556.09 |
| Adhesive weight/Total | 1 : 1.62 |
| Tractive force/Heating surface | 1 : 8.50 |
| Grate area/Heating surface | 1 : 71.96 |
| Firebox/Tube surface | 1 : 11.02 |
| Total/Superheater | 1 : 3.98 |
