GWR 4700 Class
|GWR 4700 Class|
GWR Class 4700 2-8-0 4706 at Old Oak Common MPD, London, on 15 December 1963
|Type and origin|
|Designer||George Jackson Churchward|
|Builder||GWR Swindon Works|
|Order number||Lots 214, 221|
|Serial number||4700: 2866,
|Build date||1919 (1), 1922–1923 (8)|
|UIC classification||1'D h2|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|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|
|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)|
|2,062.35 sq ft (191.599 m2)|
|– 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)
|Cylinder size||19 in × 30 in (483 mm × 762 mm)|
|Valve type||Piston valves|
|Tractive effort||30,460 lbf (135.5 kN)|
|Operator(s)||GWR » BR|
|Power class||GWR: D,
|Axle load class||GWR: Red|
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 had 5 ft 8 in driving wheels - the intermediate of Churchward's three standard wheel sizes, and were intended for express goods trains.
Accidents and incidents
- On 12 November 1958, locomotive No. 4707 was hauling a freight train when it overran signals and was derailed at Highworth Junction, Swindon, Wiltshire. A newspaper train collided with the wreckage.
The prototype, No. 4700, was constructed in 1919. It was built with a Standard No. 1 boiler as the intended design of a larger boiler, the Standard No. 7, was not yet ready. 4700 was converted to the Standard No. 7 when it was available, and the rest of the class was built with them.
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. However, the Great Western Society made the decision to create the next locomotive in the sequence, 4709. Supported via a GWS sub-group, it is being built using a mixture of new parts and others recycled from former Barry scrapyard locomotives:
- GWR 5101 class 2-6-2T 4115 - six of the eight driving wheels and the frame extension.
- GWR 2800 class 2-8-0 2861 - the cylinder block.
- GWR 5205 class 2-8-0T 5227 - the axleboxes, horns, fourth axle (axle only) and other various components.
The plates for the new frames were cut and machined in 2012, and 4709 is now under construction at Llangollen, alongside other new-build projects 6880 Betton Grange and 45551 The Unknown Warrior.
- "Great Western Locomotive Types, 47xx". Retrieved 2006-01-01.
- Daniel, John (2000). "Great Western steam locomotives, '4700' class". The Great Western Archive. Retrieved 2006-01-01.
- Overton, Tim. "GWR Locomotive Evolution". Archived from the original on August 21, 2004. Retrieved 2006-01-01. (Version from WayBack Machine (as of 27 April 2006))
- Whitehurst, Brian (1973). Great Western engines, names, numbers, types, classes: 1940 to preservation. Oxford: Oxford Publishing Company. pp. 42, 103, 138. ISBN 0-902888-21-8. OCLC 815661.