| Rhymney Railway S and S1 classes
 | 
|---|
|  Class S1 0-6-0T No. at Cardiff 1950 | 
| | Type and origin | 
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 | Power type | Steam | 
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 | Designer | C. T. Hurry Riches | 
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 | Build date | 1908–1920 | 
|---|
 | Total produced | 7 4(S), 3(S1) | 
|---|
 | 
| | Specifications | 
|---|
 | Configuration: 
 |  | 
|---|
 | • Whyte | 0-6-0T | 
|---|
 | Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge | 
|---|
 | Driver dia. | 4 ft 6 in (1.372 m) | 
|---|
 | Loco weight | S 55.06–66.95 long tons (55.94–68.02 t); S1 56.08–66.95 long tons (56.98–68.02 t) | 
|---|
 | Fuel type | Coal | 
|---|
 | Boiler pressure | 175 lbf/in2 (1.21 MPa); Rebuilt: 200 lbf/in2 (1.38 MPa)
 | 
|---|
 | Cylinders | Two, inside | 
|---|
 | Cylinder size | 18 in × 26 in (457 mm × 660 mm) | 
|---|
 | 
| | Performance figures | 
|---|
 | Tractive effort | S 23,870 lbf (106.2 kN); S1: 25,210 lbf (112.1 kN)
 | 
|---|
 | 
| | Career | 
|---|
 | Operators | RR, GWR, BR | 
|---|
 | Class | RR: S & S1 | 
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 | Power class | BR: 4F | 
|---|
 | Numbers | RR: 32-4, 111–4 GWR/BR: 78-83
 | 
|---|
 | Withdrawn | 1954–5 | 
|---|
 | Disposition | All scrapped | 
|---|
 | 
 The Rhymney Railway S class was a class of 0-6-0T steam locomotives introduced into traffic in 1908 designed by the railway's engineer Hurry Riches. There were initially four locos in the class. A further 4 ‘S1’ locomotives with a larger boiler and higher tractive effort were built in 1920. 
 References
 - Casserley, H. C. & Johnston, Stuart W. (1966). Locomotives at the Grouping 4: Great Western Railway. Shepperton, Middlesex: Ian Allan Limited. p. 9-6.
External links