GWR 3100 Class
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Churchward (rebuilt by Collett) |
| Builder | GWR Swindon Works |
| Order number | Lot 319 |
| Build date | 1906 |
| Rebuild date | 1938 |
| Number rebuilt | 5 |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 2-6-2T |
| • UIC | 1'C1 ht |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) standard gauge |
| Leading dia. | 3 ft 0 in (0.914 m) |
| Driver dia. | 5 ft 3 in (1.600 m) |
| Trailing dia. | 3 ft 8 in (1.118 m) |
| Minimum curve | 6 chains (396 ft; 121 m) normal, 5 chains (330 ft; 101 m) slow |
| Length | 41 ft 0 in (12.50 m) over buffers |
| Width | 8 ft 11 1⁄4 in (2.724 m) |
| Height | 13 ft 2 in (4.013 m) |
| Axle load | 19 long tons 3 cwt (42,900 lb or 19.5 t) (21.4 short tons) full |
| Adhesive weight | 57 long tons 6 cwt (128,400 lb or 58.2 t) (64.2 short tons) full |
| Loco weight | 81 long tons 9 cwt (182,400 lb or 82.8 t) (91.2 short tons) full |
| Fuel type | Coal |
| Water cap | 2,000 imp gal (9,100 l; 2,400 US gal) |
| Firebox: • Firegrate area |
20.56 sq ft (1.910 m2) |
| Boiler pressure | 225 lbf/in2 (1.55 MPa) |
| Heating surface: • Tubes |
1,349 sq ft (125.3 m2) |
| • Firebox | 128.72 sq ft (11.958 m2) |
| Superheater: |
|
| • Type | 4-element or 6-element |
| • Heating area | 4-element: 136.64 sq ft (12.694 m2), 6-element: 181.10 sq ft (16.825 m2) |
| Cylinders | Two, outside |
| Cylinder size | 18.5 in × 30 in (470 mm × 762 mm) |
| Performance figures | |
|---|---|
| Tractive effort | 31,170 lbf (138.7 kN) |
| Career | |
|---|---|
| Operators | GWR » BR |
| Class | 3100 |
| Power class | GWR: D, BR: 4MT |
| Numbers | 3100–3104 |
| Axle load class | GWR: Red |
| Withdrawn | 1957–1960 |
| Disposition | All scrapped |
The Great Western Railway (GWR) 3100 Class was a class of 2-6-2T side tank steam locomotive.
This class of large prairie was created in 1938 when Collett rebuilt some of Churchward's 3150 Class with a view to using them as bankers, particularly from Severn Tunnel Junction shed. These engines used the standard class 4 boiler again, but pressed to 225 psi (1,550 kPa). and using smaller coupled wheels of 5 feet 3 inches (1.600 m) diameter, and one-half inch (13 mm) increase in cylinder diameter, nominal tractive effort rose to 31,170 pounds (14,140 kg). Almost impossible to pick out was a 2 in (50.8 mm) reduction in pony truck wheel diameter to 3 ft 0 in (914 mm). Only five engines were ever modified, namely 3173, 3156, 3181, 3155 and 3179 which were rebuilt as 3100 to 3104 respectively. None of these were preserved.
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