The London and North Eastern Railway Class P1 Mineral 2-8-2 Mikado was a class of two steam locomotives designed by Nigel Gresley. They were two of the most powerful freight locomotives ever designed for a British railway. 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 marshalling yard. The power was quoted as being 25% more than the O2.
Quick Facts Type and origin, Power type ...
LNER Class P1 |
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No. 2394, circa. 1928, with booster engine and Westinghouse pump |
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Specifications |
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Configuration:
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• Whyte | 2-8-2 |
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Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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Leading dia. | 3 ft 2 in (0.965 m) |
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Driver dia. | 5 ft 2 in (1.575 m) |
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Trailing dia. | 3 ft 8 in (1.118 m) |
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Wheelbase | 36 ft 2 in (11.02 m) |
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Axle load | 18.65 long tons (18.95 t; 20.89 short tons) |
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Loco weight | 100 long tons (102 t; 112 short tons) |
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Tender weight | 51.4 long tons (52.2 t; 57.6 short tons) |
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Total weight | 151.4 long tons (153.8 t; 169.6 short tons) |
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Firebox: | |
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• Grate area | 41.25 sq ft (3.832 m2) |
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Boiler | 6 ft 5 in (1.96 m) max. |
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Boiler pressure | 180 psi (1.2 MPa) (as P1/1) 220 psi (1.5 MPa) (as P1/2) |
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Heating surface: | |
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• Firebox | 215 sq ft (20.0 m2) |
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• Tubes | 1,880 sq ft (175 m2) |
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• Flues | 835 sq ft (77.6 m2) |
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• Total surface | 3,455 sq ft (321.0 m2) |
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Superheater | Robinson |
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Cylinders | 3 (2 outside, one inside) |
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Cylinder size | 20 in × 26 in (508 mm × 660 mm) (as P1/1) 19 in × 26 in (483 mm × 660 mm)) (as P1/2) 10 in × 12 in (254 mm × 305 mm) booster |
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Valve gear | Walschaerts on outside cylinders, Gresley drove the third cylinder |
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Valve type | 8-inch (203 mm) piston valves |
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Performance figures |
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Tractive effort | (85% boiler pressure) 38,500 lbf (171 kN) (as P1/1) 42,500 lbf (189 kN) (as P1/2) 8,500 lbf (38 kN) booster |
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