GWR 4575 Class
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Charles Collett |
| Builder | GWR Swindon Works |
| Order number | Lots 242, 249, 251, 253 |
| Build date | 1927–1929 |
| Total produced | 100 |
| 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 2 in (0.965 m) |
| Driver dia. | 4 ft 7 1⁄2 in (1.410 m) |
| Trailing dia. | 3 ft 2 in (0.965 m) |
| Minimum curve | 5 chains (330 ft; 100 m) normal, 4.5 chains (300 ft; 91 m) slow |
| Wheelbase | 26 ft 10 in (8.18 m) |
| Length | 36 ft 4 1⁄2 in (11.09 m) over buffers |
| Width | 8 ft 9 in (2.667 m) |
| Height | 13 ft 0 in (3.962 m) |
| Axle load | 15 long tons 11 cwt (34,800 lb or 15.8 t) (17.4 short tons) full |
| Adhesive weight | 46 long tons 5 cwt (103,600 lb or 47 t) (51.8 short tons) full |
| Loco weight | 61 long tons 0 cwt (136,600 lb or 62 t) (68.3 short tons) full |
| Fuel type | Coal |
| Water cap | 1,300 imp gal (5,900 l; 1,600 US gal) |
| Firebox: • Firegrate area |
16.6 sq ft (1.54 m2) |
| Boiler pressure | 200 lbf/in2 (1.38 MPa) |
| Heating surface: • Tubes |
992.51 sq ft (92.207 m2) |
| • Firebox | 94.25 sq ft (8.756 m2) |
| Superheater: |
|
| • Type | 4-element or 6-element |
| • Heating area | 4-element: 52.98 sq ft (4.922 m2), 6-element: 69.84 sq ft (6.488 m2) |
| Cylinders | Two, outside |
| Cylinder size | 17 in × 24 in (432 mm × 610 mm) |
| Valve gear | Stephenson |
| Valve type | piston valves |
| Train brakes | Vacuum |
| Performance figures | |
|---|---|
| Tractive effort | 21,250 lbf (94.5 kN) |
| Career | |
|---|---|
| Operators | GWR » BR |
| Class | 4575 |
| Power class | GWR: C, BR: 4MT |
| Number in class | 100 |
| Numbers | 4575–4599, 5500–5574 |
| Nicknames | Small Prairie |
| Axle load class | GWR: Yellow |
| Withdrawn | 1956–1964 |
| Preserved | 4588, 5521, 5526, 5532, 5538, 5539, 5541, 5542, 5552, 5553, 5572 |
| Disposition | 11 preserved, remainder scrapped |
The Great Western Railway (GWR) 4575 Class is a class of 2-6-2T steam locomotives.
They were designed as small mixed traffic branch locomotives, mainly used on branch lines. They were a development of Churchward's 4500 Class with larger side tanks and increased water capacity. 100 were built numbered 4575–4599 and 5500–5574. A number were fitted with auto apparatus in 1953 to enable them to run push-pull trains on South Wales lines with .
They often are referred to as Small Prairie Class tank locomotives.
11 of these engines survive:
One of these locomotives with the GWR Shirtbutton logo was featured in the train chase sequence from the 1978 Disney film Candleshoe.
Lima made a model of the 4575 class, number 4589, in GWR green, also a British Railways black-liveried version, running number 5574. Bachmann Branchline have for many years made various versions of the 4575 Class.
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Wikipedia