The London, Midland and Scottish Railway (LMS) Princess Royal Class is a class of express passenger 4-6-2 steam locomotive designed by William Stanier. Twelve examples were built at Crewe Works, between 1933 and 1935, for use on the West Coast Main Line. Two are preserved.
Quick Facts Princess Royal Class, Type and origin ...
Princess Royal Class |
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Specifications |
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Configuration:
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• Whyte | 4-6-2 |
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• UIC | 2′C1′ h4s |
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Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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Leading dia. | 3 ft 0 in (0.914 m) |
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Driver dia. | 6 ft 6 in (1.981 m) |
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Trailing dia. | 3 ft 9 in (1.143 m) |
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Minimum curve | - 6 chains (121 m) normal
- 4+1⁄2 chains (91 m) dead slow
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Wheelbase | 63 ft 10 in (19.456 m) |
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• Engine | 37 ft 9 in (11.506 m) |
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• Drivers | 15 ft 3 in (4.648 m) |
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• Tender | 15 ft 0 in (4.572 m) |
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Length | 74 ft 4+1⁄4 in (22.663 m) |
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Width | 9 ft 0 in (2.743 m) |
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Height | 13 ft 3 in (4.039 m) |
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Axle load | 22.5 long tons (22.9 t) |
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• Leading | 21 long tons (21 t) |
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• Coupled | 22 long tons (22 t) |
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• Trailing | 16 long tons (16 t) |
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• Tender axle | - Front: 18.6 long tons (18.9 t)
- Middle: 17.8 long tons (18.1 t)
- Rear: 18.25 long tons (18.54 t)
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Adhesive weight | 67.5 long tons (68.6 t) |
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Loco weight | - 104.5 long tons (117.0 short tons; 106.2 t)
- 46202: 110.55 long tons (123.82 short tons; 112.32 t)
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Tender weight | 54.65 long tons (61.21 short tons; 55.53 t) |
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Fuel type | Coal |
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Fuel capacity | - 9 long tons (10 short tons; 9.1 t)
- later 10 long tons (11 short tons; 10 t)
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Water cap. | 4,000 imp gal (18,000 L; 4,800 US gal) |
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Firebox: | |
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• Type | |
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• Grate area | 45 sq ft (4.2 m2) |
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Boiler:
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• Model | LMS type 1 |
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• Tube plates | 19 ft 3 in (5.867 m) |
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• Small tubes | 2+3⁄8 in (60 mm), 32 off |
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• Large tubes | 5+1⁄8 in (130 mm), 123 off |
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Boiler pressure | 250 psi (1.7 MPa) |
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Heating surface: | |
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• Firebox | 190 or 217 sq ft (17.7 or 20.2 m2) |
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• Tubes and flues | 2,299 sq ft (213.6 m2) |
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• Total surface | |
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Superheater:
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• Heating area | 584 sq ft (54.3 m2) |
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Cylinders | 4 |
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Cylinder size | Production Models: 16+1⁄4 in × 28 in (413 mm × 711 mm) |
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Valve gear | Walschaerts 6205 had outside Walschaerts with rocking shafts operating inside valves. |
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Valve type | Piston valves |
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Performance figures |
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Tractive effort | 40,286 lbf (179.20 kN) (production engines) |
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Career |
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Operators | |
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Power class | 7P reclassified 8P in 1951 |
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Numbers | (4)6200/1/3–12 |
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Nicknames | Lizzies |
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Locale | London Midland Region |
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Withdrawn | 1961 (6), 1962 (6) |
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Preserved | 6201, 6203 |
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Disposition | Two preserved, remainder scrapped |
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