Compare locomotives
Add a locomotive
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...
| London & North Eastern Gresley classes A1 and A3Remove | |
|---|---|
| Variant | |
| Built | 1922-1925 |
| Manufacturers | Doncaster;North British |
| Wheel arrangement | 2C1 |
| Gauge | 1435 mm |
| Length | 21460 mm |
| Service mass | 93939 kg |
| Top speed | 145 km/h |
| Power | |
| Engine |
General
| Property | London & North Eastern Gresley classes A1 and A3Remove |
|---|---|
| Built | 1922-1925 |
| Manufacturers | Doncaster, North British |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | London & North Eastern Gresley classes A1 and A3Remove |
|---|---|
| Length | 21.46 m |
| Wheelbase | 10.90 m |
| Total wheelbase | 18.56 m |
| Service mass | 93.9 t |
| Adhesion mass | 61 t |
| Total mass | 151.1 t |
| Rigid wheelbase | 4.42 m |
| Axle load | 20.3 t |
| Water capacity | 22,731 l |
| Fuel capacity | 8.1 t (coal) |
Boiler
| Property | London & North Eastern Gresley classes A1 and A3Remove |
|---|---|
| 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 A3Remove |
|---|---|
| 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 A3Remove |
|---|---|
| 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 A3Remove |
|---|---|
| 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 |
