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London & North Eastern Gresley classes A1 and A3
Since at the beginning of the 1920s the Atlantic express locomotives of the Great Northern Railway could no longer cope with the increasing train weights, Sir Nigel Gresley began to develop a Pacific locomotive. The f...
General
| Property | London & North Eastern Gresley classes A1 and A3 Remove |
|---|---|
| Built | 1922-1925 |
| Manufacturers | Doncaster, North British |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London & North Eastern Gresley classes A1 and A3 Remove |
|---|---|
| Length | 21.46 m |
| Wheelbase | 10.90 m |
| Rigid wheelbase | 4.42 m |
| Total wheelbase | 18.56 m |
| Service weight | 93.9 t |
| Adhesive weight | 61 t |
| Axle load | 20.3 t |
| Total weight | 151.1 t |
| Water capacity | 22,731 l |
| Fuel capacity | 8.1 t (coal) |
Boiler
| Property | London & North Eastern Gresley classes A1 and A3 Remove |
|---|---|
| Grate area | 4.041 m² |
| Firebox surface | 19.974 m² |
| Tube heating surface | 252.232 m² |
| Evaporative heating surface | 272.206 m² |
| Superheater surface | 48.774 m² |
| Total heating surface | 321.0 m² |
Power plant
| Property | London & North Eastern Gresley classes A1 and A3 Remove |
|---|---|
| Driver diameter | 2,032 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | three, 508 x 660 mm |
Power
| Property | London & North Eastern Gresley classes A1 and A3 Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,641 kW (2,231 PS) |
| Top speed | 145 km/h |
| Starting effort | 132.7 kN |
Calculated values
| Property | London & North Eastern Gresley classes A1 and A3 Remove |
|---|---|
| Factor of adhesion | 1 : 4.51 |
| Optimal speed | 76 km/h |
| Power-to-weight ratio | 17.5 kW/t |
| Heating Surface Equivalent | 469.6 m² |
| Cylinder volume/HSE | 1 : 855.06 |
| Adhesive weight/Total | 1 : 1.54 |
| Tractive force/Heating surface | 1 : 8.64 |
| Grate area/Heating surface | 1 : 79.43 |
| Firebox/Tube surface | 1 : 12.63 |
| Total/Superheater | 1 : 5.58 |
