Class of 41 two-cylinder 2-6-2T locomotives
| GWR 3150 Class [1] |
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 3171 at Gloucester (Horton Road) Depot 1948 |
| Type and origin |
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| Power type | Steam |
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| Designer | George Jackson Churchward |
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| Builder | GWR Swindon Works |
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| Order number | Lots 159, 169, 172 |
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| Serial number | 2157, 2239–2258, 2280–2299 |
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| Build date | 1906–1908 |
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| Total produced | 41 |
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| Specifications |
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Configuration:
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| • Whyte | 2-6-2T |
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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 (0.965 m) |
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| Driver dia. | 5 ft 8 in (1.727 m) |
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| Trailing dia. | 3 ft 8 in (1.118 m) |
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| Length | 41 ft 0 in (12.50 m) over buffers |
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| Loco weight | 64 long tons 13 cwt (144,800 lb or 65.7 t)
(65.7 t; 72.4 short tons) empty
81 long tons 12 cwt (182,800 lb or 82.9 t)
(82.9 t; 91.4 short tons) full |
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| Fuel type | Coal |
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| Water cap. | 2,000 imp gal (9,100 L; 2,400 US gal) |
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| Firebox: | |
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| • Grate area | 20.56 sq ft (1.910 m2) |
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| Boiler | GWR Standard No. 4 |
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| Boiler pressure | 200 lbf/in2 (1.38 MPa) |
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| Heating surface: | |
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| • Firebox | 128.72 sq ft (11.958 m2) |
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| • Tubes | 1,349.64 sq ft (125.386 m2) |
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| Cylinders | Two, outside |
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| Cylinder size | 18+1⁄2 in × 30 in (470 mm × 762 mm) |
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| Valve gear | Stephenson |
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| Valve type | Piston valves |
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| Train brakes | Vacuum |
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| Career |
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| Power class | 4MT |
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| Number in class | 41 |
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| Numbers | 3150-3190 |
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| First run | 1907 |
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The Great Western Railway (GWR) 3150 Class was a class of 2-6-2T side tank steam locomotive.
- ^ GWR Engines - Names, Numbers, Types, Classes, ETC. of Great Western Railway Locomotives. Great Western Railway. 1938. p. 70.
