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