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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-2 - modified |
|---|---|
| Built | 1946 |
| Manufacturers | Hillyard |
| 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-2 - modified |
|---|---|
| Wheelbase | 18.44 m |
| Rigid wheelbase | 5.03 m |
| Total wheelbase | 32.61 m |
| Service weight | 311.4 t |
| Adhesive weight | 268.5 t |
| Axle load | 33.6 t |
| Total weight | 480.5 t |
| Water capacity | 83,279 l |
| Fuel capacity | 21,955 l (oil) |
Boiler
| Property | Great Northern (US) classes R-1 and R-2 R-2 - modified |
|---|---|
| Grate area | 11.706 m² |
| Firebox surface | 57.879 m² |
| Tube heating surface | 686.368 m² |
| Evaporative heating surface | 744.247 m² |
| Superheater surface | 326.555 m² |
| Total heating surface | 1,070.8 m² |
Power plant
| Property | Great Northern (US) classes R-1 and R-2 R-2 - modified |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 16.5 bar |
| Expansion type | simple expansion |
| Cylinders | four, 660 x 813 mm |
Power
| Property | Great Northern (US) classes R-1 and R-2 R-2 - modified |
|---|---|
| Power source | steam |
| Estimated power | 4,400 kW (5,982 PS) |
| Starting effort | 623.2 kN |
Calculated values
| Property | Great Northern (US) classes R-1 and R-2 R-2 - modified |
|---|---|
| Factor of adhesion | 1 : 4.23 |
| Optimal speed | 43 km/h |
| Power-to-weight ratio | 14.1 kW/t |
| Heating Surface Equivalent | 1,686.8 m² |
| Cylinder volume/HSE | 1 : 660.23 |
| Adhesive weight/Total | 1 : 1.16 |
| Tractive force/Heating surface | 1 : 12.15 |
| Grate area/Heating surface | 1 : 91.47 |
| Firebox/Tube surface | 1 : 11.86 |
| Total/Superheater | 1 : 2.28 |
