| GWR 3252 Duke class |
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| Type and origin |
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| 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 97, 101, 102, 105, 113 |
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| Serial number | 1431–1432, 1493–1510, 1531–1550, 1682–1701 |
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| Build date | 1895–1899 |
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| Total produced | 60 |
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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 ht |
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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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| Axle load | 15 long tons 7 cwt (34,400 lb or 15.6 t)
(15.6 t; 17.2 short tons) full |
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| Loco weight | 46 long tons 0 cwt (103,000 lb or 46.7 t)
(46.7 t; 51.5 short tons) full |
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| Tender weight | 24 long tons 0 cwt (53,800 lb or 24.4 t)
(24.4 t; 26.9 short tons) full |
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| Total weight | 70 long tons 0 cwt (156,800 lb or 71.1 t)
(71.1 t; 78.4 short tons) full |
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| Fuel type | Coal |
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| Boiler | GWR Duke |
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| Boiler pressure | 160 lbf/in2 (1.1 MPa)
180 lbf/in2 (1.2 MPa)
after refit |
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| Heating surface: | |
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| • Firebox | 115.27 sq ft (10.709 m2) |
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| • Tubes | 1,285.58 sq ft (119.434 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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| Withdrawn | 1929–1951 |
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| Disposition | 20 rebuilt to Bulldogs, 30 rebuilt to Dukedogs, remainder scrapped |
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The Great Western Railway 3252 or Duke Class were 4-4-0 steam locomotives with outside frames and parallel domed boilers. They were built in five batches between 1895 and 1899 for express passenger train work in Devon and Cornwall. William Dean was their designer, possibly with the collaboration of his assistant, George Jackson Churchward. Four prototype 4-4-0s, of the Armstrong Class, had already been built in 1894.
