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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,...
General
| Property | London & North Eastern Gresley class A4Remove |
|---|---|
| Built | 1935-1938 |
| Manufacturers | Doncaster |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London & North Eastern Gresley class A4Remove |
|---|---|
| Length | 21.65 m |
| Wheelbase | 10.90 m |
| Rigid wheelbase | 4.42 m |
| Service weight | 104.7 t |
| Adhesive weight | 67.1 t |
| Axle load | 22.4 t |
| Total weight | 169.8 t |
| Water capacity | 22,731 l |
| Fuel capacity | 8.1 t (coal) |
Boiler
| Property | London & North Eastern Gresley class A4Remove |
|---|---|
| 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 A4Remove |
|---|---|
| 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 A4Remove |
|---|---|
| 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 A4Remove |
|---|---|
| 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 |
