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London & North Eastern class A8
The class A8 of the LNER was created when Gresley rebuilt all 45 locomotives of the North Eastern class D, the later LNER class H1 that had been designed by Vincent Raven. To make this 4-4-4T better suited for heavy s...
| London & North Eastern class A8Remove | |
|---|---|
| Variant | Standard |
| Built | 1931-1936 |
| Manufacturers | Gateshead |
| Wheel arrangement | 2C1 t |
| Gauge | 1435 mm |
| Length | 12954 mm |
| Service mass | 88193 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | London & North Eastern class A8 Standard Remove |
|---|---|
| Built | 1931-1936 |
| Manufacturers | Gateshead |
| Wheel arrangement | 4-6-2T (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | London & North Eastern class A8 Standard Remove |
|---|---|
| Length | 12.95 m |
| Wheelbase | 10.14 m |
| Service mass | 88.2 t |
| Adhesion mass | 54 t |
| Axle load | 18.1 t |
| Water capacity | 9,093 l |
| Fuel capacity | 4.1 t (coal) |
Boiler
| Property | London & North Eastern class A8 Standard Remove |
|---|---|
| Grate area | 2.137 m² |
| Firebox surface | 11.52 m² |
| Tube heating surface | 89.28 m² |
| Evaporative heating surface | 100.8 m² |
| Superheater surface | 17.744 m² |
| Total heating surface | 118.5 m² |
Power plant
| Property | London & North Eastern class A8 Standard Remove |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 12.1 bar |
| Expansion type | simple expansion |
| Cylinders | three, 419 x 660 mm |
Power
| Property | London & North Eastern class A8 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 727 kW (988 PS) |
| Starting effort | 101.8 kN |
Calculated values
| Property | London & North Eastern class A8 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 5.20 |
| Optimal speed | 43 km/h |
| Power-to-weight ratio | 8.2 kW/t |
| Heating Surface Equivalent | 193.9 m² |
| Cylinder volume/HSE | 1 : 1,409.62 |
| Adhesive weight/Total | 1 : 1.63 |
| Tractive force/Heating surface | 1 : 17.94 |
| Grate area/Heating surface | 1 : 55.47 |
| Firebox/Tube surface | 1 : 7.75 |
| Total/Superheater | 1 : 5.68 |
