The Great Western Railway 4900 Class or Hall Class is a class of 4-6-0 mixed-traffic steam locomotives designed by Charles Collett for the Great Western Railway. A total of 259 were built at Swindon Works, numbered 4900–4999, 5900–5999 and 6900–6958. The LMS Stanier Class 5 4-6-0 and LNER Thompson Class B1 both drew heavily on design features of the Hall Class. After nationalisation in 1948, British Railways gave them the power classification 5MT.
Quick Facts Type and origin, Power type ...
GWR 4900 Class |
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Type and origin |
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Power type | Steam |
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Designer | Charles Collett |
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Builder | GWR Swindon Works |
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Order number | Lots 254, 268, 275, 281, 290, 297, 304, 311, 327, 333, 338, 340 |
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Build date | 1928–1943 |
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Total produced | 258 |
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Rebuilder | GWR Swindon Works |
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Rebuild date | 1924 |
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Number rebuilt | 1 (4900 Saint Martin) |
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Specifications |
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Configuration:
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• Whyte | 4-6-0 |
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• UIC | 2′C h2 |
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Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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Leading dia. | 3 ft 0 in (0.914 m) |
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Driver dia. | 6 ft 0 in (1.829 m) |
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Minimum curve | 8 chains (528 ft; 161 m) normal, 7 chains (462 ft; 141 m) slow |
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Length | 63 ft 0+1⁄4 in (19.21 m) over buffers |
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Width | 8 ft 11+1⁄4 in (2.724 m) |
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Height | 13 ft 3+1⁄4 in (4.045 m) |
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Axle load | 18 long tons 19 cwt (42,400 lb or 19.3 t) (21.2 short tons) |
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Adhesive weight | 57 long tons 0 cwt (127,700 lb or 57.9 t) (63.8 short tons) |
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Loco weight | 75 long tons 0 cwt (168,000 lb or 76.2 t) (84.0 short tons) |
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Tender weight | 46 long tons 14 cwt (104,600 lb or 47.4 t) (52.3 short tons) |
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Fuel type | Coal |
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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) |
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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) |
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Firebox: | |
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• Grate area | 27.07 sq ft (2.515 m2) |
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Boiler | GWR Standard No. 1 |
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Boiler pressure | 225 lbf/in2 (1,550 kPa; 15.8 kgf/cm2) |
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Heating surface: | |
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• Firebox | 154.78 sq ft (14.380 m2) |
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• Tubes and flues | 1,686.60 sq ft (156.690 m2) |
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Superheater:
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• Heating area | 262.62 sq ft (24.398 m2) |
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Cylinders | Two, outside |
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Cylinder size | 18.5 in × 30 in (470 mm × 762 mm) |
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Career |
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Operators | GWR » BR |
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Power class | GWR: D, BR: 5MT |
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Numbers | 4900–4999, 5900–5999, 6900–6958 |
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Official name | Hall |
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Axle load class | GWR: Red |
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Withdrawn | 1941 (4911 Bowden Hall, was destroyed beyond repair during a bombing raid and then cut up), 1959–1965 (remainder) |
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Preserved | 4920, 4930, 4936, 4942, 4953, 4965, 4979, 5900, 5952, 5967, 5972 |
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Disposition | Ten preserved or extant (two operational as of March 2021), one rebuilt as Saint class, remainder scrapped |
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