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Great Western Railway class 7800 “Manor”
The Manor class was designed in the late thirties when the GWR found out that the axle load of the mixed-traffic Grange class was too high for many lines. Therefore Charles Collett had the lighter Swindon No. 14 boile...
General
| Property | Great Western Railway class 7800 “Manor”Remove |
|---|---|
| Built | 1938-1939, 1950 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Western Railway class 7800 “Manor”Remove |
|---|---|
| Length | 18.83 m |
| Wheelbase | 8.26 m |
| Rigid wheelbase | 4.50 m |
| Total wheelbase | 15.89 m |
| Service weight | 70 t |
| Adhesive weight | 51.2 t |
| Axle load | 17.5 t |
| Total weight | 110.6 t |
| Water capacity | 15,910 l |
| Fuel capacity | 7.1 t (coal) |
Boiler
| Property | Great Western Railway class 7800 “Manor”Remove |
|---|---|
| Grate area | 2.053 m² |
| Firebox surface | 13.006 m² |
| Tube heating surface | 119.427 m² |
| Evaporative heating surface | 132.433 m² |
| Superheater surface | 17.652 m² |
| Total heating surface | 150.1 m² |
Power plant
| Property | Great Western Railway class 7800 “Manor”Remove |
|---|---|
| Driver diameter | 1,727 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 457 x 762 mm |
Power
| Property | Great Western Railway class 7800 “Manor”Remove |
|---|---|
| Power source | steam |
| Estimated power | 969 kW (1,317 PS) |
| Starting effort | 121.6 kN |
Calculated values
| Property | Great Western Railway class 7800 “Manor”Remove |
|---|---|
| Factor of adhesion | 1 : 4.13 |
| Optimal speed | 48 km/h |
| Power-to-weight ratio | 13.8 kW/t |
| Heating Surface Equivalent | 232.8 m² |
| Cylinder volume/HSE | 1 : 1,074.89 |
| Adhesive weight/Total | 1 : 1.37 |
| Tractive force/Heating surface | 1 : 16.92 |
| Grate area/Heating surface | 1 : 73.11 |
| Firebox/Tube surface | 1 : 9.18 |
| Total/Superheater | 1 : 7.50 |
