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Boston & Albany class D-1a
These heavy tank locomotives were designed for commuter service in the Boston area. Thanks to the tank locomotive design rarely used in the USA, they could run in both directions at high speed. A three-axle rear bogie...
| Boston & Albany class D-1aRemove | |
|---|---|
| Variant | Standard |
| Built | 1928 |
| Manufacturers | ALCO |
| Wheel arrangement | 2C3 t |
| Gauge | 1435 mm |
| Length | |
| Service mass | 159665 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Boston & Albany class D-1a Standard Remove |
|---|---|
| Built | 1928 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-6-6T |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Boston & Albany class D-1a Standard Remove |
|---|---|
| Length loco | 17.30 m |
| Wheelbase | 13.01 m |
| Service mass | 159.7 t |
| Adhesion mass | 81.6 t |
| Rigid wheelbase | 4.57 m |
| Axle load | 27.2 t |
| Water capacity | 18,927 l |
| Fuel capacity | 5.4 t (coal) |
Boiler
| Property | Boston & Albany class D-1a Standard Remove |
|---|---|
| Grate area | 5.649 m² |
| Firebox surface | 19.788 m² |
| Tube heating surface | 236.717 m² |
| Evaporative heating surface | 256.506 m² |
| Superheater surface | 73.208 m² |
| Total heating surface | 329.7 m² |
Power plant
| Property | Boston & Albany class D-1a Standard Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 14.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 597 x 660 mm |
Power
| Property | Boston & Albany class D-1a Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,790 kW (2,434 PS) |
| Starting effort | 185.3 kN |
Calculated values
| Property | Boston & Albany class D-1a Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.32 |
| Optimal speed | 60 km/h |
| Power-to-weight ratio | 11.2 kW/t |
| Heating Surface Equivalent | 501.9 m² |
| Cylinder volume/HSE | 1 : 736.46 |
| Adhesive weight/Total | 1 : 1.96 |
| Tractive force/Heating surface | 1 : 11.74 |
| Grate area/Heating surface | 1 : 58.37 |
| Firebox/Tube surface | 1 : 11.96 |
| Total/Superheater | 1 : 3.50 |
