| 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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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.
