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The Taff Vale Railway U and U1 classes were 0-6-2T steam tank locomotive operated by Taff Vale Railway, Wales, from 1895. All were still in use when the Taff Vale Railway was acquired by the Great Western Railway in 1922 but were withdrawn from traffic between 1927 and 1931.
Tom Hurry Riches, the Taff Vale Railway's Locomotive Superintendent brought out 2 similar classes, the U and the U1 for working passenger trains, both 0-6-2Ts. The only difference between the U and U1 class was in the radial wheels which were 3 ft 8+3⁄4 in (1.137 m) in the former and 3 ft 1 in (0.940 m) in the latter.
The boilers were identical with those fitted on the N, O and O1 classes but worked at the design pressure of 160 pounds-force per square inch (1.10 MPa), the mixed traffic engines being worked at 150 psi (1.03 MPa), or occasionally 140 psi (0.97 MPa). The main differences from the mixed traffic engines were larger diameter driving wheels, a longer wheelbase and replacing the usual four bar motion with single bar.
| Year | Quantity | Manufacturer | Serial Numbers | TVR Numbers | GWR Numbers | Notes |
|---|---|---|---|---|---|---|
| 1895 | 8 | Vulcan Foundry | 1437–1444 | 191–194, 23, 72, 76 and 77 | 593, 595–597, 587, 589–591 | U class |
| 1896 | 7 | Vulcan Foundry | 1458–1464 | 30, 40, 79, 195–198 | 602, 588, 592, 598, 599, 603, 600 | U1 class |
The Rhymney Railway was a railway company in South Wales, founded to transport minerals and materials to and from collieries and ironworks in the Rhymney Valley of South Wales, and to docks in Cardiff. It opened a main line in 1858, and a limited passenger service was operated in addition.
George Jackson Churchward was an English railway engineer, and was chief mechanical engineer of the Great Western Railway (GWR) in the United Kingdom from 1902 to 1922.
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A steam railcar is a rail vehicle that does not require a locomotive as it contains its own steam engine. The first steam railcar was an experimental unit designed and built in 1847 by James Samuel and William Bridges Adams. In 1848, they made the Fairfield steam carriage that they sold to the Bristol and Exeter Railway, who used it for two years on a branch line.
West Yard Works was the Taff Vale Railway's locomotive repair and construction factory. It was located in Cardiff between Bute Street and the Glamorganshire Canal, about 100 metres west of Bute Dock railway station.
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