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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...
General
| Property | Great Western Railway class 4073 “Castle”Remove |
|---|---|
| Built | 1923-1950 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Western Railway class 4073 “Castle”Remove |
|---|---|
| Length | 19.86 m |
| Wheelbase | 8.31 m |
| Rigid wheelbase | 4.50 m |
| Total wheelbase | 16.62 m |
| Service weight | 81.1 t |
| Adhesive weight | 59.8 t |
| Axle load | 20 t |
| Total weight | 128.2 t |
| Water capacity | 13,249 l |
| Fuel capacity | 6.1 t (coal) |
Boiler
| Property | Great Western Railway class 4073 “Castle”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”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”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”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 |
