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Great Northern (US) classes R-1 and R-2
In the twenties, the Great Northern needed powerful freight locomotives for the more than 900 mile-long stretch from Minot, North Dakota through Montana to Spokane, Washington. They needed lots of pulling power for th...
| Great Northern (US) classes R-1 and R-2Remove | |
|---|---|
| Variant | |
| Built | 1929-1930 |
| Manufacturers | Hillyard |
| Wheel arrangement | (1D)D1 ma |
| Gauge | 1435 mm |
| Length | |
| Service mass | 286104 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Great Northern (US) classes R-1 and R-2Remove |
|---|---|
| Built | 1929-1930 |
| Manufacturers | Hillyard |
| Wheel arrangement | 2-8-8-2 (Mikado Mallet) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Great Northern (US) classes R-1 and R-2Remove |
|---|---|
| Wheelbase | 18.44 m |
| Total wheelbase | 32.31 m |
| Service mass | 286.1 t |
| Adhesion mass | 246.8 t |
| Total mass | 455.2 t |
| Rigid wheelbase | 5.03 m |
| Axle load | 30.8 t |
| Water capacity | 83,279 l |
| Fuel capacity | 21,955 l (oil) |
Boiler
| Property | Great Northern (US) classes R-1 and R-2Remove |
|---|---|
| Grate area | 11.706 m² |
| Firebox surface | 44.686 m² |
| Tube heating surface | 686.368 m² |
| Evaporative heating surface | 731.055 m² |
| Superheater surface | 326.555 m² |
| Total heating surface | 1,057.6 m² |
Power plant
| Property | Great Northern (US) classes R-1 and R-2Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 16.5 bar |
| Expansion type | simple expansion |
| Cylinders | four, 711 x 813 mm |
Power
| Property | Great Northern (US) classes R-1 and R-2Remove |
|---|---|
| Power source | steam |
| Estimated power | 3,729 kW (5,070 PS) |
| Starting effort | 722.7 kN |
Calculated values
| Property | Great Northern (US) classes R-1 and R-2Remove |
|---|---|
| Factor of adhesion | 1 : 3.35 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 13.0 kW/t |
| Heating Surface Equivalent | 1,607.6 m² |
| Cylinder volume/HSE | 1 : 803.42 |
| Adhesive weight/Total | 1 : 1.16 |
| Tractive force/Heating surface | 1 : 14.27 |
| Grate area/Heating surface | 1 : 90.35 |
| Firebox/Tube surface | 1 : 15.36 |
| Total/Superheater | 1 : 2.24 |
