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London & North Eastern Peppercorn class A2
The Peppercorn class A2 was a Pacific locomotive designed in the last years of the LNER and inspired by the Thompson class A2/2. Like Thompson's locomotives, it had three cylinders and 6 ft 2 in (1,880 mm) drivers, as...
General
| Property | London & North Eastern Peppercorn class A2Remove |
|---|---|
| Built | 1947-1948 |
| Manufacturers | Doncaster |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London & North Eastern Peppercorn class A2Remove |
|---|---|
| Length | 21.65 m |
| Wheelbase | 10.47 m |
| Rigid wheelbase | 3.96 m |
| Total wheelbase | 18.44 m |
| Service weight | 102.6 t |
| Axle load | 22.4 t |
| Total weight | 163.1 t |
| Water capacity | 22,731 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | London & North Eastern Peppercorn class A2Remove |
|---|---|
| Grate area | 4.645 m² |
| Firebox surface | 22.761 m² |
| Tube heating surface | 205.966 m² |
| Evaporative heating surface | 228.728 m² |
| Superheater surface | 63.174 m² |
| Total heating surface | 291.9 m² |
Power plant
| Property | London & North Eastern Peppercorn class A2Remove |
|---|---|
| Driver diameter | 1,880 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | three, 483 x 660 mm |
Power
| Property | London & North Eastern Peppercorn class A2Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,237 kW (3,041 PS) |
| Starting effort | 179.8 kN |
Calculated values
| Property | London & North Eastern Peppercorn class A2Remove |
|---|---|
| Optimal speed | 76 km/h |
| Power-to-weight ratio | 21.8 kW/t |
| Heating Surface Equivalent | 468.9 m² |
| Cylinder volume/HSE | 1 : 772.91 |
| Tractive force/Heating surface | 1 : 12.87 |
| Grate area/Heating surface | 1 : 62.84 |
| Firebox/Tube surface | 1 : 9.05 |
| Total/Superheater | 1 : 3.62 |
