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Great Northern (UK) class O2
The GNR O2 was development of the O1, which initially differed almost only in the number and arrangement of the cylinders. Instead of the previous two cylinders, three smaller ones were now used to improve power trans...
General
| Property | Great Northern (UK) class O2 Remove |
|---|---|
| Built | 1918 |
| Manufacturers | Doncaster, North British |
| Wheel arrangement | 2-8-0 (Consolidation) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Northern (UK) class O2 Remove |
|---|---|
| Length | 18.71 m |
| Wheelbase | 8.28 m |
| Rigid wheelbase | 5.64 m |
| Total wheelbase | 15.91 m |
| Service weight | 77.6 t |
| Adhesive weight | 67.7 t |
| Axle load | 17.4 t |
| Total weight | 121.4 t |
| Water capacity | 19,094 l |
| Fuel capacity | 7.3 t (coal) |
Boiler
| Property | Great Northern (UK) class O2 Remove |
|---|---|
| Grate area | 2.555 m² |
| Firebox surface | 15.19 m² |
| Tube heating surface | 178.978 m² |
| Evaporative heating surface | 194.168 m² |
| Superheater surface | 40.041 m² |
| Total heating surface | 234.2 m² |
Power plant
| Property | Great Northern (UK) class O2 Remove |
|---|---|
| Driver diameter | 1,422 mm |
| Boiler pressure | 11.7 bar |
| Expansion type | simple expansion |
| Cylinders | three, 457 x 660 mm |
Power
| Property | Great Northern (UK) class O2 Remove |
|---|---|
| Power source | steam |
| Estimated power | 858 kW (1,167 PS) |
| Starting effort | 145.0 kN |
Calculated values
| Property | Great Northern (UK) class O2 Remove |
|---|---|
| Factor of adhesion | 1 : 4.58 |
| Optimal speed | 35 km/h |
| Power-to-weight ratio | 11.1 kW/t |
| Heating Surface Equivalent | 350.2 m² |
| Cylinder volume/HSE | 1 : 928.78 |
| Adhesive weight/Total | 1 : 1.15 |
| Tractive force/Heating surface | 1 : 12.93 |
| Grate area/Heating surface | 1 : 91.67 |
| Firebox/Tube surface | 1 : 11.78 |
| Total/Superheater | 1 : 4.85 |
