| GWR 4700 Class | |
|---|---|
| GWR Class 4700 2-8-0 4706 at Old Oak Common MPD, London, on 15 December 1963 | |
| Power type | Steam |
| Designer | George Jackson Churchward |
| Builder | GWR Swindon Works |
| Order number | Lots 214, 221 |
| Serial number | 4700: 2866, 4701–4708: none |
| Build date | 1919 (1), 1922–1923 (8) |
| Total produced | 9 |
| Configuration | 2-8-0 |
| UIC classification | 1'D h2 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading wheel diameter |
3 ft 2 in (0.965 m) |
| Driver diameter | 5 ft 8 in (1.727 m) |
| Minimum curve | 8 chains (530 ft; 160 m) normal, 7 chains (460 ft; 140 m) slow |
| Length | 66 ft 4 1⁄4 in (20.22 m) |
| Width | 8 ft 11 in (2.72 m) |
| Height | 13 ft 4 3⁄4 in (4.08 m) |
| Axle load | 19 tons 12 cwt (43,900 lb or 19.9 t) full |
| Weight on drivers | 73 tons 8 cwt (164,400 lb or 74.6 t) full |
| Locomotive weight | 82 tons 0 cwt (183,700 lb or 83.3 t) full |
| Tender weight | 46 tons 14 cwt (104,600 lb or 47.4 t) full |
| Fuel type | Coal |
| Water capacity | 4,000 imperial gallons (18,000 l; 4,800 US gal) |
| Boiler pressure | 225 lbf/in² (1.55 MPa) |
| Firegrate area | 30.28 sq ft (2.813 m2) |
| Heating surface: Tubes |
2,062.35 sq ft (191.599 m2) |
| Heating surface: Firebox |
169.75 sq ft (15.770 m2) |
| Superheater type | 4-element or 6-element |
| Superheater area | 4-element: 211.20 sq ft (19.621 m2), 6-element: 276.98 sq ft (25.732 m2) |
| Cylinders | Two, outside |
| Cylinder size | 19 × 30 in (483 × 762 mm) |
| Valve gear | Stephenson |
| Valve type | Piston valves |
| Tractive effort | 30,460 lbf (135.5 kN) |
| Career | GWR » BR |
| Class | 4700 |
| Power class | GWR: D, BR: 7F |
| Number | 4700–4708 |
| Axle load class | GWR: Red |
| Withdrawn | 1962–1964 |
| Disposition | All scrapped |
The Great Western Railway (GWR) 4700 Class was a class of nine 2-8-0 steam locomotives, numbered 4700 through 4708. They were the final locomotives designed by George Jackson Churchward and were introduced in 1919–1921 for fast goods work. Although built for freight, the class sometimes hauled passenger trains, notably heavy holiday expresses in the summer.
The 4700 Class was intended for a quite different role than the 2800 Class. The 2800s were small-wheeled mineral haulers with 4 ft 7½ in driving wheels. The 4700s used the 5 ft 8 in driving wheels and the cylinders from the 4300 Class Mogul (2-6-0), and were intended for express goods trains.
The prototype, No.4700, was constructed in 1919. It was built with a standard No.1 boiler, the same used in the 2800 Class, but testing proved it inadequate. A new, larger design, the No.7, was introduced in 1921 for the remaining eight of the class.
Withdrawals began in June 1962 with No.4702, while the last were removed from service in May 1964. No.4705 recorded the greatest distance travelled, at 1,656,564 miles.
No members of the class were preserved. A member of the GWR 5101 class, 4115, is being broken up to provide parts for a projected replica.[1]
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