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Great Western Railway class 6959 “Modified Hall”
Just after Frederick William Hawksworth had become Chief Mechanical Engineer of the GWR in 1941, he developed a modernized version of the Hall class. This had been designed by Collett in the twenties and still had muc...
| Great Western Railway class 6959 “Modified Hall”Remove | |
|---|---|
| Variant | Standard |
| Built | 1944-1950 |
| Manufacturers | Swindon |
| Wheel arrangement | 2C |
| Gauge | 1435 mm |
| Length | 19209 mm |
| Service mass | 77016 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Great Western Railway class 6959 “Modified Hall” Standard Remove |
|---|---|
| Built | 1944-1950 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Great Western Railway class 6959 “Modified Hall” Standard Remove |
|---|---|
| Length | 19.21 m |
| Service mass | 77 t |
| Adhesion mass | 58.9 t |
| Total mass | 125.1 t |
| Axle load | 19.6 t |
| Water capacity | 18,185 l |
| Fuel capacity | 6.1 t (coal) |
Boiler
| Property | Great Western Railway class 6959 “Modified Hall” Standard Remove |
|---|---|
| Grate area | 2.515 m² |
| Firebox surface | 14.391 m² |
| Tube heating surface | 147.028 m² |
| Evaporative heating surface | 161.419 m² |
| Superheater surface | 27.406 m² |
| Total heating surface | 188.8 m² |
Power plant
| Property | Great Western Railway class 6959 “Modified Hall” Standard Remove |
|---|---|
| Driver diameter | 1,829 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 470 x 762 mm |
Power
| Property | Great Western Railway class 6959 “Modified Hall” Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,491 kW (2,027 PS) |
| Starting effort | 121.3 kN |
Calculated values
| Property | Great Western Railway class 6959 “Modified Hall” Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.76 |
| Optimal speed | 76 km/h |
| Power-to-weight ratio | 19.4 kW/t |
| Heating Surface Equivalent | 288.2 m² |
| Cylinder volume/HSE | 1 : 917.09 |
| Adhesive weight/Total | 1 : 1.31 |
| Tractive force/Heating surface | 1 : 13.42 |
| Grate area/Heating surface | 1 : 75.08 |
| Firebox/Tube surface | 1 : 10.22 |
| Total/Superheater | 1 : 5.89 |
