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Great Northern (US) class O-8
The O-8 was a class of 25 Mikados, most of which had been rebuilt from other locomotives. In their final form they were the heaviest and most powerful locomotives of this wheel arrangement ever with a total weight of ...
General
| Property | Great Northern (US) class O-8 1932 variant |
|---|---|
| Built | 1932 |
| Manufacturers | Great Northern |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Northern (US) class O-8 1932 variant |
|---|---|
| Wheelbase | 8.61 m |
| Rigid wheelbase | 5.56 m |
| Total wheelbase | 25.46 m |
| Service weight | 166.5 t |
| Adhesive weight | 127 t |
| Axle load | 31.8 t |
| Total weight | 314.6 t |
| Water capacity | 65,298 l |
| Fuel capacity | 21,955 l (oil) |
Boiler
| Property | Great Northern (US) class O-8 1932 variant |
|---|---|
| Grate area | 9.151 m² |
| Firebox surface | 41.342 m² |
| Tube heating surface | 402.828 m² |
| Evaporative heating surface | 444.17 m² |
| Superheater surface | 196.026 m² |
| Total heating surface | 640.2 m² |
Power plant
| Property | Great Northern (US) class O-8 1932 variant |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | two, 737 x 813 mm |
Power
| Property | Great Northern (US) class O-8 1932 variant |
|---|---|
| Power source | steam |
| Estimated power | 3,430 kW (4,664 PS) |
| Starting effort | 368.7 kN |
Calculated values
| Property | Great Northern (US) class O-8 1932 variant |
|---|---|
| Factor of adhesion | 1 : 3.38 |
| Optimal speed | 56 km/h |
| Power-to-weight ratio | 20.6 kW/t |
| Heating Surface Equivalent | 1,042.9 m² |
| Cylinder volume/HSE | 1 : 664.22 |
| Adhesive weight/Total | 1 : 1.31 |
| Tractive force/Heating surface | 1 : 12.03 |
| Grate area/Heating surface | 1 : 69.96 |
| Firebox/Tube surface | 1 : 9.74 |
| Total/Superheater | 1 : 2.27 |
