| GWR 7029 Clun Castle |
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 Clun Castle in 2017 |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-0 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Leading dia. | 3 ft 2 in (0.965 m) |
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| Driver dia. | 6 ft 8+1⁄2 in (2.045 m) |
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| Length | 65 ft 2 in (19.86 m) over buffers |
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| Width | 8 ft 11 in (2.718 m) |
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| Height | 13 ft 1 in (3.988 m) (Cut back from 13 ft 4+1⁄2 in (4.077 m)) |
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| Loco weight | 79 long tons 17 cwt (178,900 lb or 81.1 t)
89.4 short tons full |
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| Tender weight | 47 long tons 6 cwt (106,000 lb or 48.1 t)
53.0 short tons full |
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| Fuel type | Coal |
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| Fuel capacity | 6 long tons 0 cwt (13,400 lb or 6.1 t)
6 long tons 0 hundredweight (6.10 t; 6.72 short tons) |
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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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| • Grate area | 29.36 sq ft (2.728 m2) |
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| Boiler | GWR Standard Number 8 |
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| Boiler pressure | 225 lbf/in2 (1.55 MPa) |
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| Heating surface: | |
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| • Firebox | 162.7 sq ft (15.12 m2) (Collett)
163.5 sq ft (15.19 m2) (Hawksworth) |
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| • Tubes | 1,857.7 sq ft (172.59 m2) (Collett)
1,799.5 sq ft (167.18 m2) (Hawksworth) |
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| Cylinders | Four (two inside, two outside) |
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| Cylinder size | 16 in × 26 in (406 mm × 660 mm) |
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| Valve gear | Inside cylinders: Walschaerts
Outside cylinders: derived from inside cylinders via rocking bars. |
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| Valve type | Piston valves |
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| Loco brake | Vacuum |
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| Performance figures |
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| Maximum speed | 25 mph - (heritage railways) 45 mph - (mainline, tender first) 75 mph - (mainline, chimney first) |
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| Tractive effort | 31,625 lbf (140.68 kN) |
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GWR 4073 Class No. 7029 Clun Castle is a 4-6-0 steam locomotive built at Swindon Works in May 1950 to a design by Charles Collett for operation on the Western Region of British Railways. It was named after Clun Castle in Shropshire.
