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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...
General
| Property | Great Northern (US) classes R-1 and R-2 R-1 - Baldwin |
|---|---|
| Built | 1925 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2-8-8-2 (Mikado Mallet) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Northern (US) classes R-1 and R-2 R-1 - Baldwin |
|---|---|
| Wheelbase | 17.73 m |
| Rigid wheelbase | 5.03 m |
| Total wheelbase | 29.35 m |
| Service weight | 262.2 t |
| Adhesive weight | 231.3 t |
| Axle load | 28.9 t |
| Total weight | 408 t |
| Water capacity | 63,595 l |
| Fuel capacity | 21,955 l (oil) |
Boiler
| Property | Great Northern (US) classes R-1 and R-2 R-1 - Baldwin |
|---|---|
| Grate area | 10.034 m² |
| Firebox surface | 39.112 m² |
| Tube heating surface | 622.823 m² |
| Evaporative heating surface | 661.935 m² |
| Superheater surface | 176.144 m² |
| Total heating surface | 838.1 m² |
Power plant
| Property | Great Northern (US) classes R-1 and R-2 R-1 - Baldwin |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 14.5 bar |
| Expansion type | simple expansion |
| Cylinders | four, 711 x 813 mm |
Power
| Property | Great Northern (US) classes R-1 and R-2 R-1 - Baldwin |
|---|---|
| Power source | steam |
| Estimated power | 2,983 kW (4,056 PS) |
| Starting effort | 632.4 kN |
Calculated values
| Property | Great Northern (US) classes R-1 and R-2 R-1 - Baldwin |
|---|---|
| Factor of adhesion | 1 : 3.59 |
| Optimal speed | 29 km/h |
| Power-to-weight ratio | 11.4 kW/t |
| Heating Surface Equivalent | 1,209.8 m² |
| Cylinder volume/HSE | 1 : 1,067.60 |
| Adhesive weight/Total | 1 : 1.13 |
| Tractive force/Heating surface | 1 : 15.76 |
| Grate area/Heating surface | 1 : 83.52 |
| Firebox/Tube surface | 1 : 15.92 |
| Total/Superheater | 1 : 3.76 |
