| GWR 3800 'County' Class | 
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3818 County of Radnor as built in 1906  | 
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| Specifications | 
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 Configuration:
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 |  • Whyte | 4-4-0 | 
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 | Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge | 
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 | Leading dia. | 3 ft 2 in (965 mm) | 
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 | Driver dia. | 6 ft 8+1⁄2 in (2,045 mm) | 
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 | Wheelbase | 24 ft 0 in (7,315 mm) | 
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 | Axle load | 18.15 long tons (18.44 t; 20.33 short tons) | 
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 | Adhesive weight | 34.3 long tons (34.85 t; 38.42 short tons) | 
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 | Loco weight | 55.3 long tons (56.19 t; 61.94 short tons) | 
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 | Tender weight | 36.75 long tons (37.34 t; 41.16 short tons) | 
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 | Total weight | 92.05 long tons (93.53 t; 103.10 short tons) | 
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 | Fuel type | Coal | 
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 | Water cap. | 3,000 imp gal (13,638 L; 3,603 US gal) | 
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 | Firebox: |  | 
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 |  • Grate area | 20.56 sq ft (1.91 m2) | 
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 | Boiler | GWR Standard No. 4 | 
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 | Boiler pressure | 200 psi (1,379 kPa) | 
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 | Heating surface: |  | 
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 |  • Firebox | 128.30 sq ft (11.92 m2) | 
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 |  • Tubes | 1,689.82 sq ft (156.99 m2) | 
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 |  • Total surface | 1,818.12 sq ft (168.91 m2) | 
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 | Cylinders | 2, outside | 
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 | Cylinder size | 18 in × 30 in (457 mm × 762 mm)  diameter x stroke | 
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 | Valve gear | Stephenson | 
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| Career | 
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 | Operators | Great Western Railway | 
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 | Class | 3800 | 
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 | Power class | GWR: C | 
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 | Number in class | 40 | 
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 | Numbers | 3473–82, 3801–30 until Dec 1912 3800–39 from December 1912 | 
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 | Official name | County | 
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 | Nicknames | Churchward's Rough Riders | 
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 | Axle load class | GWR: Red | 
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 | Withdrawn | 1930–33 | 
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 | Disposition | All original locomotives scrapped; one new-build under construction | 
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| Dimensions as built | 
The Great Western Railway 3800 Class, also known as the County Class, were a class of 4-4-0 steam locomotives for express passenger train work introduced in 1904 in a batch of ten. Two more batches followed in 1906 and 1912 with minor differences. They were designed by George Jackson Churchward, who used standard components to produce a four-coupled version of his Saint Class 4-6-0s.