| GWR 5101 Class | |
|---|---|
| Preserved 5101 Class locomotive 4160 at Minehead, West Somerset Railway, painted in British Railways lined-green livery. | |
| Power type | Steam |
| Designer | George Jackson Churchward Charles Collett |
| Builder | GWR Swindon Works |
| Build date | 1903–1949 |
| Total produced | 209 |
| Configuration | 2-6-2T |
| Gauge | 1,435 mm (4 ft 8 1⁄2 in) Standard gauge |
| Leading wheel diameter |
3 ft 2 in (0.97 m) |
| Driver diameter | 5 ft 8 in (1.73 m) |
| Trailing wheel diameter |
3 ft 8 in (1.12 m) |
| Length | 41 ft (12.50 m) |
| Locomotive weight | 78.45 long tons (79.71 t) |
| Fuel type | Coal |
| Fuel capacity | 4.0 long tons (4.1 t) |
| Water capacity | 2,000 imp gal (9,100 L) |
| Boiler | GWR Number 2 |
| Boiler pressure | 200 psi (1,400 kPa) |
| Firegrate area | 20.35 sq ft (1.891 m2) |
| Heating surface: Tubes and flues |
1,144.94 sq ft (106.368 m2) |
| Heating surface: Firebox |
121.8 sq ft (11.32 m2) |
| Superheater area | 82.2 sq ft (7.64 m2) |
| Cylinders | Two |
| Cylinder size | 18 × 30 in (46 × 76 cm) |
| Tractive effort | 24,300 lbf (108 kN) |
| Class | GWR 5101 |
| Power class | GWR D BR 4MT |
| Axle load class | GWR Blue |
| Withdrawn | December 1965 |
The GWR 5101 Class or Large Prairie was a class of 2-6-2T steam locomotives of the Great Western Railway. They were medium-sized tank engines used for suburban and local passenger services all over the Great Western Railway system. The class was a modification by Collett of Churchward's 1903 3100 Class.
Ten have been preserved: 4110, 4115, 4121, 4141, 4144, 4150, 4160, 5164, 5193 and 5199. One of these, 5193, has been rebuilt by the West Somerset Railway into a 2-6-0 resembling the 4300 Class, and numbered 9351. Out of the ten surviving 5101's seven came from Woodham Brothers scrapyard in Barry, Vale of Glamorgan, South Wales.
No.4115 was one of the later locomotives, being turned out by Swindon Works in October 1936. It spent most of its working life in the Birmingham area but was based for a time at Croes Newydd Shed at Wrexham before being withdrawn from service in June 1965. It was one of the last locomotives (the "Barry Ten") to leave Woodham Brothers and has not yet been restored.
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