GWR 3300 Class
3338 Laira
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| Type and origin | |
|---|---|
| Figures given are for 3341 class version | |
| Power type | Steam |
| Designer | William Dean |
| Builder | GWR Swindon Works |
| Order number | Lots 124, 137, 142, 148, 162, 163, 177 |
| Build date | 1899–1910 |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 4-4-0 |
| • UIC | 2'B ht |
| 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: • Firegrate area |
20.35 sq ft (1.891 m2) |
| Boiler pressure | 200 lbf/in2 (1.4 MPa) |
| Heating surface: • Tubes |
1,144.95 sq ft (106.369 m2) |
| • Firebox | 121.80 sq ft (11.316 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| Withdrawn | 1929-1951 |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. 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.
No. 3312 Bulldog was built in October 1898, with curved outside frames, a domed parallel boiler with a raised Belpaire firebox and a wrapper-type smokebox. The boiler was a prototype for the parallel version of Churchward's Standard No. 2 boilers.Bulldog was originally classed as a variant of the Duke Class.
In October 1899 no. 3352 Camel appeared with the final form of the parallel No. 2 boiler, domeless, with a raised Belpaire firebox and a circular drumhead smokebox supported on a curved saddle. A further twenty locomotives, nos. 3332 to 3351, were built between November 1899 and March 1900. Between May and December 1900 a second batch of twenty Camels (as the class were initially known) were built with straight-topped outside frames. These were numbered 3353 to 3372. A third batch, 3413 to 3432 were built between December 1902 and May 1903; these were the last to be built with parallel boilers.
In September 1903 no. 3443 Birkenhead was built with a tapered Standard No. 2 boiler. The boiler was tapered only over the rear half of the barrel, and this type became known as the "half-cone"; a later version of the No. 2 boiler was tapered over three-quarters of the barrel. A further twenty-nine locomotives were built with the half-cone boiler between September 1903 and April 1904, bringing the class total to ninety-one.
Between April and September 1906 thirty locomotives were built with the three-quarter coned No. 2 boiler. In March 1906, Bulldog was rebuilt with the same type of boiler, and the class now became known as the Bulldog Class. From October 1906 to January 1909 eighteen of the Duke Class were converted to Bulldogs by the fitting of No. 2 boilers. A further member of the Duke Class, no. 3273 Armorel, had been fitted with a parallel domeless boiler in February 1902, thus becoming a Camel Class locomotive. It ran with tapered boilers of various types from April 1906.
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Wikipedia