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Great Western Railway class 4575 “Small Prairie”
From 1927, the then chief engineer of the GWR, Charles Collett, procured 100 pieces of an improved version of the Class 4500 developed by Churchward. The most important difference concerned larger water tanks, which c...
| Great Western Railway class 4575 “Small Prairie”Remove | |
|---|---|
| Variant | Standard |
| Built | 1927-1929 |
| Manufacturers | Swindon |
| Wheel arrangement | 1C1 t |
| Gauge | 1435 mm |
| Length | 11087 mm |
| Service mass | 61977 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Great Western Railway class 4575 “Small Prairie” Standard Remove |
|---|---|
| Built | 1927-1929 |
| Manufacturers | Swindon |
| Wheel arrangement | 2-6-2T (Prairie) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Great Western Railway class 4575 “Small Prairie” Standard Remove |
|---|---|
| Length | 11.09 m |
| Wheelbase | 8.18 m |
| Service mass | 62 t |
| Adhesion mass | 47 t |
| Rigid wheelbase | 3.53 m |
| Axle load | 15.8 t |
| Water capacity | 4,921 l |
| Fuel capacity | 3.8 t (coal) |
Boiler
| Property | Great Western Railway class 4575 “Small Prairie” Standard Remove |
|---|---|
| Grate area | 1.533 m² |
| Firebox surface | 8.733 m² |
| Tube heating surface | 92.206 m² |
| Evaporative heating surface | 100.939 m² |
| Superheater surface | 6.503 m² |
| Total heating surface | 107.4 m² |
Power plant
| Property | Great Western Railway class 4575 “Small Prairie” Standard Remove |
|---|---|
| Driver diameter | 1,410 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 432 x 610 mm |
Power
| Property | Great Western Railway class 4575 “Small Prairie” Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 634 kW (862 PS) |
| Starting effort | 94.5 kN |
Calculated values
| Property | Great Western Railway class 4575 “Small Prairie” Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.88 |
| Optimal speed | 42 km/h |
| Power-to-weight ratio | 10.2 kW/t |
| Heating Surface Equivalent | 157.6 m² |
| Cylinder volume/HSE | 1 : 1,132.78 |
| Adhesive weight/Total | 1 : 1.32 |
| Tractive force/Heating surface | 1 : 18.37 |
| Grate area/Heating surface | 1 : 70.09 |
| Firebox/Tube surface | 1 : 10.56 |
| Total/Superheater | 1 : 15.52 |
