| LNER Class P1 | |
|---|---|
| No. 2394, circa. 1928, with booster engine and Westinghouse pump | |
| Power type | steam |
| Designer | Sir Nigel Gresley |
| Builder | London & North Eastern Railway |
| Build date | June & November 1925 |
| Total produced | 2 |
| Configuration | 2-8-2 |
| Gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Leading wheel diameter |
3 ft 2 in (0.97 m) |
| Driver diameter | 5 ft 2 in (1.57 m) |
| Trailing wheel diameter |
3 ft 8 in (1.12 m) |
| Wheelbase | 36 ft 2 in (11.02 m) |
| Axle load | 18.65 long tons (18.95 t) |
| Locomotive weight | 100 long tons (101.60 t) |
| Tender weight | 51.4 long tons (52.2 t) |
| Locomotive & tender combined weight |
151.4 long tons (153.8 t) |
| Boiler | 6 ft 5 in (1.96 m) max. |
| Boiler pressure | 180 psi (1.2 MPa) |
| Firegrate area | 41.25 sq ft (3.832 m2) |
| Heating surface: Tubes |
1,880 sq ft (175 m2) |
| Heating surface: Flues |
835 sq ft (77.6 m2) |
| Heating surface: Firebox |
215 sq ft (20.0 m2) |
| Heating surface: Total |
3,455 sq ft (321.0 m2) |
| Superheater type | Robinson |
| Cylinders | 3, with 2 more in a booster unit |
| Cylinder size | 20 × 26 in (510 × 660 mm) 10 × 12 in (250 × 300 mm) booster |
| Valve gear | Walschaerts & Gresley, with steam reversing gear |
| Tractive effort | (85% boiler pressure) 38,500 lbf (171 kN) 8,500 lbf (38 kN) booster |
The London and North Eastern Railway Class P1 Mineral 2-8-2 Mikado was a class of 2 steam locomotives designed by Nigel Gresley. They were some of the most powerful freight locomotives ever designed in Britain, and it was initially intended they be a more powerful 2-10-0 version of the earlier Class O2 2-8-0s. The design was submitted in August 1923, for use between Peterborough and London, and also between Immingham and Wath Yard. The power was quoted as being 25% more than the O2.
There were two locomotives built: No. 2393 was completed in June 1925, whilst No. 2394 was completed in November. They differed in the main by having different superheaters fitted. There were four others planned to replace older 0-8-0 locomotives, but these were never built. They were initially put to work between New England and Ferme Park yards, which was the only route deemed suitable for them. However, they were only economically viable when hauling heavier trains of 1000 tons or more, loads which were comparatively rare on Britain's railways at that time. The locomotives were finally withdrawn in July 1945, and the boilers used to rebuild Class A1 Nos. 2557 and 2565 to Class A3, and the tenders modified and used on Thompson Class B2 locomotives, so neither survived into preservation.
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