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London & North Eastern Gresley class A4
Gresley developed the class A4 locomotive for the “Silver Jubilee” express train, which consisted of specially developed articulated cars. It was based on his A3 and was streamlined. Like this, it had three cylinders,...
| London & North Eastern Gresley class A4Remove | |
|---|---|
| Variant | Standard |
| Built | 1935-1938 |
| Manufacturers | Doncaster |
| Wheel arrangement | 2C1 |
| Gauge | 1435 mm |
| Length | 21650 mm |
| Service mass | 104653 kg |
| Top speed | 145 km/h |
| Power | |
| Engine |
General
| Property | London & North Eastern Gresley class A4 Standard Remove |
|---|---|
| Built | 1935-1938 |
| Manufacturers | Doncaster |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | London & North Eastern Gresley class A4 Standard Remove |
|---|---|
| Length | 21.65 m |
| Wheelbase | 10.90 m |
| Service mass | 104.7 t |
| Adhesion mass | 67.1 t |
| Total mass | 169.8 t |
| Rigid wheelbase | 4.42 m |
| Axle load | 22.4 t |
| Water capacity | 22,731 l |
| Fuel capacity | 8.1 t (coal) |
Boiler
| Property | London & North Eastern Gresley class A4 Standard Remove |
|---|---|
| Grate area | 3.828 m² |
| Firebox surface | 21.479 m² |
| Tube heating surface | 217.839 m² |
| Evaporative heating surface | 239.318 m² |
| Superheater surface | 69.584 m² |
| Total heating surface | 308.9 m² |
Power plant
| Property | London & North Eastern Gresley class A4 Standard Remove |
|---|---|
| Driver diameter | 2,032 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | three, 470 x 660 mm |
Power
| Property | London & North Eastern Gresley class A4 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,237 kW (3,041 PS) |
| Top speed | 145 km/h |
| Starting effort | 157.7 kN |
Calculated values
| Property | London & North Eastern Gresley class A4 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.18 |
| Optimal speed | 87 km/h |
| Power-to-weight ratio | 21.4 kW/t |
| Heating Surface Equivalent | 485.9 m² |
| Cylinder volume/HSE | 1 : 707.13 |
| Adhesive weight/Total | 1 : 1.56 |
| Tractive force/Heating surface | 1 : 10.66 |
| Grate area/Heating surface | 1 : 80.70 |
| Firebox/Tube surface | 1 : 10.14 |
| Total/Superheater | 1 : 3.44 |
