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London & North Eastern class P1
The LNER originally planned a locomotive with a 2-10-0 wheel arrangement as a more powerful successor to the GNR Class O2. Ultimately, the two class P1 locomotives were built in 1925 and had the wheel arrangement 2-8-...
General
| Property | London & North Eastern class P1 P1/1 with booster |
|---|---|
| Built | 1925 |
| Manufacturers | Doncaster |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London & North Eastern class P1 P1/1 with booster |
|---|---|
| Wheelbase | 11.02 m |
| Rigid wheelbase | 5.64 m |
| Service weight | 101.6 t |
| Adhesive weight | 72.6 t |
| Axle load | 18.7 t |
| Total weight | 153.9 t |
| Water capacity | 21,365 l |
| Fuel capacity | 7.1 t (coal) |
Boiler
| Property | London & North Eastern class P1 P1/1 with booster |
|---|---|
| Grate area | 3.832 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 class P1 P1/1 with booster |
|---|---|
| Driver diameter | 1,575 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | three, 508 x 660 mm |
Power
| Property | London & North Eastern class P1 P1/1 with booster |
|---|---|
| Power source | steam |
| Estimated power | 1,193 kW (1,622 PS) |
| Starting effort | 171.2 kN |
| Starting effort booster | 42.258 kN |
Calculated values
| Property | London & North Eastern class P1 P1/1 with booster |
|---|---|
| Factor of adhesion | 1 : 4.16 |
| Optimal speed | 42 km/h |
| Power-to-weight ratio | 11.7 kW/t |
| Heating Surface Equivalent | 469.6 m² |
| Cylinder volume/HSE | 1 : 855.06 |
| Adhesive weight/Total | 1 : 1.40 |
| Tractive force/Heating surface | 1 : 11.14 |
| Grate area/Heating surface | 1 : 83.76 |
| Firebox/Tube surface | 1 : 12.63 |
| Total/Superheater | 1 : 5.58 |
