| Taff Vale Railway O4 class | |
|---|---|
| 'O4' No. 289 at Danygraig Locomotive Depot, Swansea Docks 1946 | |
| Power type | Steam |
| Designer | Tom Hurry Riches |
| Builder | Beyer, Peacock & Co. (24); Manning Wardle (7); Vulcan Foundry (10) |
| Build date | 1907 (7), 1908 (14), 1910 (20) |
| Total produced | 41 |
| Configuration | 0-6-2T |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Driver diameter | 4 ft 6 1⁄2 in (1.384 m) |
| Locomotive weight | 61.00 long tons (61.98 t) |
| Fuel type | Coal |
| Boiler pressure | 175 psi (1.21 MPa) |
| Cylinders | Two, inside |
| Cylinder size | 17.5 × 26 in (445 × 660 mm) |
| Tractive effort | 21,730 lbf (96.7 kN) |
| Career | Taff Vale Railway Great Western Railway; British Railways |
| Retired | 1948–1955 |
| Disposition | All scrapped |
The Taff Vale Railway O4 class was a class of 0-6-2T steam tank locomotives designed by Tom Hurry Riches and introduced to the Taff Vale Railway in 1907. They were rebuilt with taper boilers and superheaters by the Great Western Railway (GWR) from 1924.
The locomotives were built in several batches by Vulcan Foundry, Manning Wardle and Beyer, Peacock and Company. Their GWR numbers were in the range 200-420 but they were not consecutive and were intermingled with other classes.
| Year | Quantity | Manufacturer | Serial Number | TVR Numbers | GWR Numbers | Notes |
|---|---|---|---|---|---|---|
| 1907 | 7 | Manning Wardle | 1698–1704 | 38, 43, 59, 67–69, 94 | 285, 287, 293–295, 420, 296 | 420 renumbered 220 sometime between 1946 and 1950 |
| 1908 | 7 | Beyer, Peacock & Co. | 5095–5101 | 39, 95, 97, 98, 101, 102, 104 | 286, 297–302 | 300 renumbered 200 sometime between 1946 and 1950 |
| 1908 | 7 | Beyer, Peacock & Co. | 5127–5133 | 6, 9, 48, 56, 58, 105, 111 | 280, 282, 289, 291, 292, 236, 314 | |
| 1910 | 10 | Beyer, Peacock & Co. | 5384–5393 | 13, 49, 112–116, 118, 119, 121 | 409, 290, 315, 317–321, 324, 333 | 315, 317, 321, 324, 333, 409 renumbered 207–211, 215–218 sometime between 1946 and 1950 |
| 1910 | 10 | Vulcan Foundry | 2529–2538 | 1, 28, 8, 17, 35, 36, 46, 108–110 | 278, 279, 281, 283, 284, 414, 288, 310, 311, 313 | 310, 311, 313, 414 renumbered 203–205, 219 sometime between 1946 and 1950 |
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