GWR 3300 Class

GWR Bulldog class
3338 Laira c. 1915
Type and origin Figures given are for 3341 class version Power type Steam Designer William Dean Builder GWR Swindon Works Order number Lots 118, 120, 124, 137, 142, 148, 162, 163, 177 Build date 1899–1910 Total produced 136 new + 20 rebuilt from Duke class
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2′B h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 3 ft 8 in (1.118 m) Driver dia. 5 ft 8 in (1.727 m) Length 56 ft 2+1⁄4 in (17.126 m) over buffers Width 8 ft 9+1⁄2 in (2.680 m) Height 12 ft 4+1⁄2 in (3.772 m) Axle load 17 long tons 12 cwt (39,400 lb or 17.9 t) full Adhesive weight 34 long tons 8 cwt (77,100 lb or 35 t) full Loco weight 51 long tons 16 cwt (116,000 lb or 52.6 t) full Tender weight 36 long tons 15 cwt (82,300 lb or 37.3 t) full Total weight 88 long tons 11 cwt (198,400 lb or 90 t) full Fuel type Coal Water cap. 3,000 imp gal (14,000 L; 3,600 US gal) Firebox: ​  • Grate area 20.35 sq ft (1.891 m2) Boiler GWR Standard No. 2 GWR Standard No. 3 Boiler pressure 200 lbf/in2 (1.4 MPa) Heating surface: ​  • Firebox 121.80 sq ft (11.316 m2)  • Tubes 1,144.95 sq ft (106.369 m2) Superheater: ​  • Heating area 82.20 sq ft (7.637 m2) Cylinders Two, inside Cylinder size 18 in × 26 in (457 mm × 660 mm) Valve gear Stephenson Train brakes Vacuum
Performance figures Tractive effort 21,060 lbf (93.7 kN)
Career Operators GWR » BR Power class GWR: B Numbers 3353–3372, 3413–3432, 3443–3472, 3701–3745 renumbered 3341–3455 in 1912 Axle load class GWR: Blue Withdrawn 1929-1951

The Bulldog and Bird classes were double-framed inside cylinder 4-4-0 steam locomotives used for passenger services on the Great Western Railway.^[1] The Bird Class were a development of the Bulldogs with strengthened outside frames, of which a total of fifteen were built. A total of 121 Bulldogs were built new, with a further twenty rebuilt from Duke Class locomotives. Thirty Bulldogs were later rebuilt as Earl Class locomotives and renumbered 3265 (prototype conversion), 3200-3228.