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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...
General
| Property | Boston & Albany class D-1aRemove |
|---|---|
| Built | 1928 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-6-6T |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Boston & Albany class D-1aRemove |
|---|---|
| Length loco | 17.30 m |
| Wheelbase | 13.01 m |
| Rigid wheelbase | 4.57 m |
| Service weight | 159.7 t |
| Adhesive weight | 81.6 t |
| Axle load | 27.2 t |
| Water capacity | 18,927 l |
| Fuel capacity | 5.4 t (coal) |
Boiler
| Property | Boston & Albany class D-1aRemove |
|---|---|
| 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-1aRemove |
|---|---|
| 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-1aRemove |
|---|---|
| Power source | steam |
| Estimated power | 1,790 kW (2,434 PS) |
| Starting effort | 185.3 kN |
Calculated values
| Property | Boston & Albany class D-1aRemove |
|---|---|
| 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 |
