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Boston & Maine class R-1
The class R-1 Mountains were the last steam locomotives ordered by the Boston & Maine. They were among the heaviest Mountains and were built in four batches between 1935 and 1941. Initially five R-1a were built, in 19...
| Boston & Maine class R-1Remove | |
|---|---|
| Variant | R-1b |
| Built | 1935-1941 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2D1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 188740 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Boston & Maine class R-1 R-1b Remove |
|---|---|
| Built | 1935-1941 |
| Manufacturers | Baldwin |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Boston & Maine class R-1 R-1b Remove |
|---|---|
| Wheelbase | 13.46 m |
| Service mass | 188.7 t |
| Adhesion mass | 122.2 t |
| Total mass | 357.8 t |
| Rigid wheelbase | 5.87 m |
| Axle load | 31.3 t |
| Water capacity | 76,465 l |
| Fuel capacity | 20.4 t (coal) |
Boiler
| Property | Boston & Maine class R-1 R-1b Remove |
|---|---|
| Grate area | 7.339 m² |
| Firebox surface | 44.129 m² |
| Tube heating surface | 374.957 m² |
| Evaporative heating surface | 419.086 m² |
| Superheater surface | 178.746 m² |
| Total heating surface | 597.8 m² |
Power plant
| Property | Boston & Maine class R-1 R-1b Remove |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 16.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 787 mm |
Power
| Property | Boston & Maine class R-1 R-1b Remove |
|---|---|
| Power source | steam |
| Estimated power | 3,057 kW (4,156 PS) |
| Starting effort | 302.1 kN |
Calculated values
| Property | Boston & Maine class R-1 R-1b Remove |
|---|---|
| Factor of adhesion | 1 : 3.97 |
| Optimal speed | 61 km/h |
| Power-to-weight ratio | 16.2 kW/t |
| Heating Surface Equivalent | 997.2 m² |
| Cylinder volume/HSE | 1 : 627.35 |
| Adhesive weight/Total | 1 : 1.54 |
| Tractive force/Heating surface | 1 : 10.55 |
| Grate area/Heating surface | 1 : 81.46 |
| Firebox/Tube surface | 1 : 8.50 |
| Total/Superheater | 1 : 2.34 |
