GWR 4900 Class

GWR 4900 Class
5900 Hinderton Hall at Didcot in 2010
Type and origin Power type Steam Designer Charles Collett Builder GWR Swindon Works Order number Lots 254, 268, 275, 281, 290, 297, 304, 311, 327, 333, 338, 340 Build date 1928–1943 Total produced 258 Rebuilder GWR Swindon Works Rebuild date 1924 Number rebuilt 1 (4900 Saint Martin)
Specifications Configuration: ​  • Whyte 4-6-0  • UIC 2′C h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 3 ft 0 in (0.914 m) Driver dia. 6 ft 0 in (1.829 m) Minimum curve 8 chains (528 ft; 161 m) normal, 7 chains (462 ft; 141 m) slow Length 63 ft 0+1⁄4 in (19.21 m) over buffers Width 8 ft 11+1⁄4 in (2.724 m) Height 13 ft 3+1⁄4 in (4.045 m) Axle load 18 long tons 19 cwt (42,400 lb or 19.3 t) (21.2 short tons) Adhesive weight 57 long tons 0 cwt (127,700 lb or 57.9 t) (63.8 short tons) Loco weight 75 long tons 0 cwt (168,000 lb or 76.2 t) (84.0 short tons) Tender weight 46 long tons 14 cwt (104,600 lb or 47.4 t) (52.3 short tons) 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 27.07 sq ft (2.515 m2) Boiler GWR Standard No. 1 Boiler pressure 225 lbf/in2 (1,550 kPa; 15.8 kgf/cm2) Heating surface: ​  • Firebox 154.78 sq ft (14.380 m2)  • Tubes and flues 1,686.60 sq ft (156.690 m2) Superheater: ​  • Heating area 262.62 sq ft (24.398 m2) Cylinders Two, outside Cylinder size 18.5 in × 30 in (470 mm × 762 mm)
Performance figures Tractive effort 27,275 lbf (121.33 kN)
Career Operators GWR » BR Power class GWR: D, BR: 5MT Numbers 4900–4999, 5900–5999, 6900–6958 Official name Hall Axle load class GWR: Red Withdrawn 1941 (4911 Bowden Hall, was destroyed beyond repair during a bombing raid and then cut up), 1959–1965 (remainder) Preserved 4920, 4930, 4936, 4942, 4953, 4965, 4979, 5900, 5952, 5967, 5972 Disposition Ten preserved or extant (two operational as of March 2021), one rebuilt as Saint class, remainder scrapped

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.