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Great Western Railway class 4073 “Castle”
After the First World War, George Churchward had already designed an express locomotive that was intended to complement and surpass his Star class. It was to receive the GWR standard boiler number 7, which was already...
| Great Western Railway class 4073 “Castle”Remove | |
|---|---|
| Variant | Standard |
| Built | 1923-1950 |
| Manufacturers | Swindon |
| Wheel arrangement | 2C |
| Gauge | 1435 mm |
| Length | 19863 mm |
| Service mass | 81131 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Great Western Railway class 4073 “Castle” Standard Remove |
|---|---|
| Built | 1923-1950 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Great Western Railway class 4073 “Castle” Standard Remove |
|---|---|
| Length | 19.86 m |
| Wheelbase | 8.31 m |
| Total wheelbase | 16.62 m |
| Service mass | 81.1 t |
| Adhesion mass | 59.8 t |
| Total mass | 128.2 t |
| Rigid wheelbase | 4.50 m |
| Axle load | 20 t |
| Water capacity | 13,249 l |
| Fuel capacity | 6.1 t (coal) |
Boiler
| Property | Great Western Railway class 4073 “Castle” Standard Remove |
|---|---|
| Grate area | 2.728 m² |
| Firebox surface | 15.115 m² |
| Tube heating surface | 172.586 m² |
| Evaporative heating surface | 187.701 m² |
| Superheater surface | 24.396 m² |
| Total heating surface | 212.1 m² |
Power plant
| Property | Great Western Railway class 4073 “Castle” Standard Remove |
|---|---|
| Driver diameter | 2,045 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | four, 406 x 660 mm |
Power
| Property | Great Western Railway class 4073 “Castle” Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,268 kW (1,724 PS) |
| Starting effort | 140.7 kN |
Calculated values
| Property | Great Western Railway class 4073 “Castle” Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.17 |
| Optimal speed | 55 km/h |
| Power-to-weight ratio | 15.6 kW/t |
| Heating Surface Equivalent | 312.1 m² |
| Cylinder volume/HSE | 1 : 1,098.03 |
| Adhesive weight/Total | 1 : 1.36 |
| Tractive force/Heating surface | 1 : 13.85 |
| Grate area/Heating surface | 1 : 77.75 |
| Firebox/Tube surface | 1 : 11.42 |
| Total/Superheater | 1 : 7.69 |
