GWR 4073 Class

Specifications
Specifications
Configuration:;
• Whyte	4-6-0
• UIC	2′C h4
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	6 ft 8+1⁄2 in (2.045 m)
Minimum curve	8 chains (530 ft; 160 m) normal,; 7 chains (460 ft; 140 m) slow
Length	65 ft 2 in (19.86 m) over buffers
Width	8 ft 11 in (2.718 m)
Height	13 ft 4+1⁄2 in (4.077 m)
Axle load	19 long tons 14 cwt (44,100 lb or 20 t); 22.1 short tons full
Adhesive weight	58 long tons 17 cwt (131,800 lb or 59.8 t); 65.9 short tons full
Loco weight	79 long tons 17 cwt (178,900 lb or 81.1 t); 89.4 short tons full
Tender weight	47 long tons 6 cwt (106,000 lb or 48.1 t); 53.0 short tons full
Fuel type	Coal
Fuel capacity	Churchward tender: 7 long tons (7.1 t; 7.8 short tons); Collett/Hawksworth tender: 6 long tons (6.1 t; 6.7 short tons);
Water cap.	Churchward tender: 3,500 imp gal (16,000 L; 4,200 US gal); Collett/Hawksworth tender: 4,000 imp gal (18,000 L; 4,800 US gal);
Firebox:
• Grate area	29.36 sq ft (2.728 m2)
Boiler	GWR Standard No. 8
Boiler pressure	225 lbf/in2 (1.55 MPa)
Heating surface:
• Firebox	162.7 sq ft (15.12 m2) (Collett); 163.5 sq ft (15.19 m2) (Hawksworth);
• Tubes	1,857.7 sq ft (172.59 m2) (Collett); 1,799.5 sq ft (167.18 m2) (Hawksworth);
Superheater:;
• Type	14-element "Swindon" (Collett); 21-element (Hawksworth);
• Heating area	262.6 sq ft (24.40 m2) (Collett); 295.0 sq ft (27.41 m2) (Hawksworth);
Cylinders	Four (two inside, two outside)
Cylinder size	16 in × 26 in (406 mm × 660 mm)
Valve gear	Inside cylinders: Walschaerts; Outside cylinders: derived from inside cylinders via rocking bars.;
Valve type	Piston valves

Type and origin
Type and origin
Power type	Steam
Designer	Charles Collett
Builder	GWR / BR Swindon Works
Order number	Lots 224, 232, 234, 280, 295, 296, 303, 310, 317, 324, 357, 367, 375
Build date	1923–1950
Total produced	171

GWR 4073 *Castle* class
GWR 4073 Castle class
	A 4073 Class at Didcot Railway Centre in 2023
Power type
Type and origin
Power type	Steam
Designer	Charles Collett
Builder	GWR / BR Swindon Works
Order number	Lots 224, 232, 234, 280, 295, 296, 303, 310, 317, 324, 357, 367, 375
Build date	1923–1950
Total produced	171
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-0
• UIC	2′C h4
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	6 ft 8+1⁄2 in (2.045 m)
Minimum curve	8 chains (530 ft; 160 m) normal,; 7 chains (460 ft; 140 m) slow
Length	65 ft 2 in (19.86 m) over buffers
Width	8 ft 11 in (2.718 m)
Height	13 ft 4+1⁄2 in (4.077 m)
Axle load	19 long tons 14 cwt (44,100 lb or 20 t); 22.1 short tons full
Adhesive weight	58 long tons 17 cwt (131,800 lb or 59.8 t); 65.9 short tons full
Loco weight	79 long tons 17 cwt (178,900 lb or 81.1 t); 89.4 short tons full
Tender weight	47 long tons 6 cwt (106,000 lb or 48.1 t); 53.0 short tons full
Fuel type	Coal
Fuel capacity	Churchward tender: 7 long tons (7.1 t; 7.8 short tons); Collett/Hawksworth tender: 6 long tons (6.1 t; 6.7 short tons);
Water cap.	Churchward tender: 3,500 imp gal (16,000 L; 4,200 US gal); Collett/Hawksworth tender: 4,000 imp gal (18,000 L; 4,800 US gal);
Firebox:
• Grate area	29.36 sq ft (2.728 m2)
Boiler	GWR Standard No. 8
Boiler pressure	225 lbf/in2 (1.55 MPa)
Heating surface:
• Firebox	162.7 sq ft (15.12 m2) (Collett); 163.5 sq ft (15.19 m2) (Hawksworth);
• Tubes	1,857.7 sq ft (172.59 m2) (Collett); 1,799.5 sq ft (167.18 m2) (Hawksworth);
Superheater:;
• Type	14-element "Swindon" (Collett); 21-element (Hawksworth);
• Heating area	262.6 sq ft (24.40 m2) (Collett); 295.0 sq ft (27.41 m2) (Hawksworth);
Cylinders	Four (two inside, two outside)
Cylinder size	16 in × 26 in (406 mm × 660 mm)
Valve gear	Inside cylinders: Walschaerts; Outside cylinders: derived from inside cylinders via rocking bars.;
Valve type	Piston valves
Tractive effort
Performance figures
Tractive effort	31,625 lbf (140.68 kN)
Operators
Career
Operators	Great Western Railway; British Railways;
Power class	GWR: D; BR: 7P;
Numbers	4073–4099; 5000–5099; 7000–7037.
Axle load class	GWR: Red
Locale	Great Western Main Line
Withdrawn	May 1950 to December 1965
Disposition	Eight preserved, remainder scrapped

The 4073 or Castle Class are 4-6-0 steam locomotives of the Great Western Railway, built between 1923 and 1950. They were designed by the railway's Chief Mechanical Engineer, Charles Collett, for working the company's express passenger trains. They could reach speeds of up to 100 mph (160 km/h).

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