LMS Princess Royal Class

Specifications
Specifications
Configuration:;
• Whyte	4-6-2
• UIC	2′C1′ h4s
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	3 ft 0 in (0.914 m)
Driver dia.	6 ft 6 in (1.981 m)
Trailing dia.	3 ft 9 in (1.143 m)
Minimum curve	6 chains (121 m) normal; 4+1⁄2 chains (91 m) dead slow;
Wheelbase	63 ft 10 in (19.456 m)
• Engine	37 ft 9 in (11.506 m)
• Drivers	15 ft 3 in (4.648 m)
• Tender	15 ft 0 in (4.572 m)
Length	74 ft 4+1⁄4 in (22.663 m)
Width	9 ft 0 in (2.743 m)
Height	13 ft 3 in (4.039 m)
Axle load	22.5 long tons (22.9 t)
• Leading	21 long tons (21 t)
• Coupled	22 long tons (22 t)
• Trailing	16 long tons (16 t)
• 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);
Adhesive weight	67.5 long tons (68.6 t)
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);
Tender weight	54.65 long tons (61.21 short tons; 55.53 t)
Fuel type	Coal
Fuel capacity	9 long tons (10 short tons; 9.1 t); later 10 long tons (11 short tons; 10 t);
Water cap.	4,000 imp gal (18,000 L; 4,800 US gal)
Firebox:
• Type
• Grate area	45 sq ft (4.2 m2)
Boiler:;
• Model	LMS type 1
• Tube plates	19 ft 3 in (5.867 m)
• Small tubes	2+3⁄8 in (60 mm), 32 off
• Large tubes	5+1⁄8 in (130 mm), 123 off
Boiler pressure	250 psi (1.7 MPa)
Heating surface
• Tubes and flues	2,299 sq ft (213.6 m2)
• Firebox	190 or 217 sq ft (17.7 or 20.2 m2)
Superheater:;
• Heating area	584 sq ft (54.3 m2)
Cylinders	4
Cylinder size	Production Models:; 16+1⁄4 in × 28 in (413 mm × 711 mm)
Valve gear	Walschaerts; 6205 had outside Walschaerts with rocking shafts operating inside valves.
Valve type	Piston valves

Type and origin
Type and origin
Power type	Steam
Designer	William Stanier
Builder	LMS Crewe Works
Build date	1933 (2), 1935 (10)
Total produced	12

*Princess Royal* Class
Princess Royal Class
	6210 Lady Patricia at Crewe Works in 1948
Power type
Type and origin
Power type	Steam
Designer	William Stanier
Builder	LMS Crewe Works
Build date	1933 (2), 1935 (10)
Total produced	12
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2
• UIC	2′C1′ h4s
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	3 ft 0 in (0.914 m)
Driver dia.	6 ft 6 in (1.981 m)
Trailing dia.	3 ft 9 in (1.143 m)
Minimum curve	6 chains (121 m) normal; 4+1⁄2 chains (91 m) dead slow;
Wheelbase	63 ft 10 in (19.456 m)
• Engine	37 ft 9 in (11.506 m)
• Drivers	15 ft 3 in (4.648 m)
• Tender	15 ft 0 in (4.572 m)
Length	74 ft 4+1⁄4 in (22.663 m)
Width	9 ft 0 in (2.743 m)
Height	13 ft 3 in (4.039 m)
Axle load	22.5 long tons (22.9 t)
• Leading	21 long tons (21 t)
• Coupled	22 long tons (22 t)
• Trailing	16 long tons (16 t)
• 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);
Adhesive weight	67.5 long tons (68.6 t)
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);
Tender weight	54.65 long tons (61.21 short tons; 55.53 t)
Fuel type	Coal
Fuel capacity	9 long tons (10 short tons; 9.1 t); later 10 long tons (11 short tons; 10 t);
Water cap.	4,000 imp gal (18,000 L; 4,800 US gal)
Firebox:
• Type
• Grate area	45 sq ft (4.2 m2)
Boiler:;
• Model	LMS type 1
• Tube plates	19 ft 3 in (5.867 m)
• Small tubes	2+3⁄8 in (60 mm), 32 off
• Large tubes	5+1⁄8 in (130 mm), 123 off
Boiler pressure	250 psi (1.7 MPa)
Heating surface
• Tubes and flues	2,299 sq ft (213.6 m2)
• Firebox	190 or 217 sq ft (17.7 or 20.2 m2)
Superheater:;
• Heating area	584 sq ft (54.3 m2)
Cylinders	4
Cylinder size	Production Models:; 16+1⁄4 in × 28 in (413 mm × 711 mm)
Valve gear	Walschaerts; 6205 had outside Walschaerts with rocking shafts operating inside valves.
Valve type	Piston valves
Tractive effort
Performance figures
Tractive effort	40,286 lbf (179.20 kN) (production engines)
Operators
Career
Operators	London, Midland and Scottish Railway; British Railways;
Power class	7P reclassified 8P in 1951
Numbers	(4)6200/1/3–12
Nicknames	Lizzies
Locale	London Midland Region
Withdrawn	1961 (6), 1962 (6)
Preserved	6201, 6203
Disposition	Two preserved, remainder scrapped

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.

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