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Great Western Railway class 4700
The class 4700 was a mixed traffic 2-8-0 with large drivers designed by George Jackson Churchward. These locomotives were commonly known as “Night Owls”, since they were mostly used for fast, long distance overnight f...
General
| Property | Great Western Railway class 4700Remove |
|---|---|
| Built | 1919, 1922-1923 |
| Manufacturers | Swindon |
| Wheel arrangement | 2-8-0 (Consolidation) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Western Railway class 4700Remove |
|---|---|
| Length | 20.23 m |
| Wheelbase | 8.92 m |
| Rigid wheelbase | 6.10 m |
| Total wheelbase | 17.32 m |
| Service weight | 83.3 t |
| Adhesive weight | 74.6 t |
| Axle load | 19.9 t |
| Total weight | 130.8 t |
| Water capacity | 18,185 l |
Boiler
| Property | Great Western Railway class 4700Remove |
|---|---|
| Grate area | 2.813 m² |
| Firebox surface | 15.77 m² |
| Tube heating surface | 191.599 m² |
| Evaporative heating surface | 207.369 m² |
| Superheater surface | 25.732 m² |
| Total heating surface | 233.1 m² |
Power plant
| Property | Great Western Railway class 4700Remove |
|---|---|
| Driver diameter | 1,727 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 483 x 762 mm |
Power
| Property | Great Western Railway class 4700Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,268 kW (1,724 PS) |
| Starting effort | 135.5 kN |
Calculated values
| Property | Great Western Railway class 4700Remove |
|---|---|
| Factor of adhesion | 1 : 5.40 |
| Optimal speed | 58 km/h |
| Power-to-weight ratio | 15.2 kW/t |
| Heating Surface Equivalent | 337.7 m² |
| Cylinder volume/HSE | 1 : 825.54 |
| Adhesive weight/Total | 1 : 1.12 |
| Tractive force/Heating surface | 1 : 12.14 |
| Grate area/Heating surface | 1 : 82.87 |
| Firebox/Tube surface | 1 : 12.15 |
| Total/Superheater | 1 : 8.06 |
