LNER Class P1
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| Power type | steam |
|---|---|
| Designer | Sir Nigel Gresley |
| Builder | London & North Eastern Railway |
| Build date | June & November 1925 |
| Total production | 2 |
| Configuration | 2-8-2 |
| Gauge | 1435 mm (4 ft 8½ in) |
| Leading wheel size | 3 ft 2 in |
| Driver size | 5 ft 2 in |
| Trailing wheel size | 3 ft 8 in |
| Wheelbase | 36 ft 2 in |
| Axle load | 18 tons 13 cwt (18.9 t) |
| Locomotive and tender combined weight | 100 long tons |
| Fuel consumption | unknown, but high |
| Boiler | 6 ft 5 in max. |
| Boiler pressure | 180 psi (1.24 MPa |
| Fire grate area | 41.25 sq. ft |
| Heating surface: Tubes | 1880 sq. ft (168×2.25 in) |
| Heating surface: Flues | 835 sq. ft (32×5.25 in) |
| Heating surface: Firebox | 215 sq. ft |
| Heating surface: Total | 3455 sq. ft |
| Superheater type | Robinson |
| Cylinders | 3, with 2 more in a booster unit |
| Cylinder size | 20 in x 26 in (10 in×12 in in booster) |
| Valve gear | Walschaerts & Gresley, with steam reversing gear |
| Tractive effort | (85% boiler pressure) 38,500 lbf (171 kN) |
The London and North Eastern Railway Class P1 Mineral 2-8-2 Mikado was a class of 2 steam locomotives designed Nigel Gresley. They were some of the most powerful freight locotives 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 (completed in November). They differed in the main by having different superheaters fitted. There four others planned to replace older 0-8-0 locomotives, but therse 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 The locomotives were finally withdrawn in July 1945, and the boilers used to rebuild Class A1 Nos. 2557 and 2565 to Class A3, and the tenders modified and used on Thompson Class B2 locomotives, so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.
| Locomotives of the London and North Eastern Railway | ||||||
| Pre-grouping railway designs | ||||||
| Great Central Railway: | A5 - B18 - D11 - J11 - O4 | |||||
| Great Eastern Railway: | J65 - J16 - J17 - Y5 - J17 - N7 - ?? - J69 - B12 - J66 - D13 - E4 - J15 - J70 | |||||
| Great North of Scotland Railway: | D40 | |||||
| Great Northern Railway: | C1 - C2 - J6 - J52 - K3 - N2 | |||||
| North British Railway: | D34 - J36 - Y9 | |||||
| North Eastern Railway: | B16 - E5 - D17 - J21 - J27 - J72 - Q6 - Q7 - X1 - Y7 | |||||
| align=left | align=leftLNER designs | |||||
| Gresley:
align=left|A1 - A3 - A4 - A8 - B17 -D49 - J38 - J39 - J50 - K4 - P1 - P2 - U1 - V1 - V2 - V3 - V4 - W1 |
Thompson: | A2 - B1 - B2 - K1 - K5 - L1 - O1 - Q1 | Peppercorn: | A1 - A2 - A6- A7 A9 - K1 - | Raven: | A2 - H1 |
