This article is about the 140 locomotives built in 1929–49. For the 40 locomotives built in 1903–06, see
GWR 5100 Class.
| GWR 5101 Class |
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| Type and origin |
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| Power type | Steam |
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| Designer | Charles Collett |
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| Builder | GWR Swindon Works |
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| Order number | Lots 257, 259, 284, 292, 313, 323, 335, 361, 369 |
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| Build date | 1929–1949 |
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| Total produced | 140 |
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| Specifications |
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Configuration:
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| • Whyte | 2-6-2T |
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| • UIC | 1′C1′ h2t |
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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 (12.50 m) |
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| Loco weight | 78.45 long tons (79.71 t; 87.86 short tons) |
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| Fuel type | Coal |
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| Fuel capacity | 4 long tons (4.1 t; 4.5 short tons) |
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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 | 20.35 sq ft (1.891 m2) |
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| Boiler | GWR Number 2 |
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| Boiler pressure | 200 psi (1,400 kPa) |
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| Heating surface: | |
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| • Firebox | 121.8 sq ft (11.32 m2) |
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| • Tubes and flues | 1,144.94 sq ft (106.368 m2) |
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Superheater:
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| • Heating area | 82.2 sq ft (7.64 m2) |
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| Cylinders | Two |
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| Cylinder size | 18 in × 30 in (457 mm × 762 mm) |
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| Career |
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| Operators | |
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| Class | GWR 5101 |
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| Power class | GWR D
BR 4MT |
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| Numbers | 5101–5199, 4100–4179 |
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| Axle load class | GWR Blue |
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| Locale | Western Region |
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| Withdrawn | April 1956 – November 1965 |
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| Disposition | 8 preserved, 1 used for spares, 1 rebuilt into tender engine; remainder scrapped |
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The GWR 5101 Class or 'Large Prairie' is a class of 2-6-2T steam locomotives of the Great Western Railway.
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