GWR 6800 Class 6880 Betton Grange
Cab for Betton Grange
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||
| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | C.B. Collett (original designer) |
| Builder | 6800 Society |
| Build date | 1994–present |
| Specifications | |
|---|---|
| Configuration | 4-6-0 |
| UIC class | 2'C h |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 3 ft 0 in (0.914 m) |
| Driver dia. | 5 ft 8 in (1.727 m) |
| Minimum curve | 8 chains (530 ft; 160 m) normal, 7 chains (460 ft; 140 m) slow |
| Length | 63 ft 0 1⁄4 in (19.21 m) |
| Width | 8 ft 11 1⁄4 in (2.72 m) |
| Height | 13 ft 0 in (3.96 m) |
| Axle load | 18 long tons 8 cwt (41,200 lb or 18.7 t) |
| Adhesive weight | 55 long tons 2 cwt (123,400 lb or 56 t) |
| Loco weight | 74 long tons 0 cwt (165,800 lb or 75.2 t) full |
| Tender weight | 40 long tons 0 cwt (89,600 lb or 40.6 t) full |
| Fuel type | Coal |
| Fuel capacity | 7 long tons 0 cwt (15,700 lb or 7.1 t) |
| Water cap | 3,500 imp gal (16,000 l; 4,200 US gal) |
| Firebox: • Firegrate area |
27.07 sq ft (2.515 m2) |
| Boiler pressure | 225 psi (1.55 MPa) |
| Heating surface | 2,461.4 sq ft (228.67 m2) |
| • Tubes and flues | 1,686.60 sq ft (156.690 m2) |
| • Firebox | 154.78 sq ft (14.380 m2) |
| Superheater: |
|
| • Heating area | 4-element: 191.8 sq ft (17.82 m2), 6-element: 253.38 sq ft (23.540 m2) |
| Cylinders | Two, outside |
| Cylinder size | 18.5 in × 30 in (470 mm × 762 mm) |
| Performance figures | |
|---|---|
| Tractive effort | 28,875 lbf (128.44 kN) |
| Career | |
|---|---|
| Operators | |
| Power class | GWR: D; BR: 5MT |
| Numbers | 6880 |
| Official name | Betton Grange |
| Axle load class | GWR: Red |
| Disposition | Under construction, Llangollen Railway |
No.6880 Betton Grange is a steam locomotive which is under construction as a "new-build" project, based on the Llangollen Railway in Denbighshire, Wales. Described as "building the 81st Grange", the project started in 1998, and the locomotive was expected to be operational by 2013. All of the original GWR 6800 Class Grange locomotives were withdrawn for scrap by the end of 1965; this project is a creation, from an assemblage of original GWR and newly manufactured components, of a member of this class.
The GWR locomotive standardisation policy pursued by G.J. Churchward envisaged a range of locomotive classes which would be suitable for the majority of duties, and yet which would share a small number of standard components. Amongst the designs suggested in 1901 was a 4-6-0 with 5-foot-8-inch (1.73 m) diameter coupled wheels, and the Standard No. 1 boiler. Although planned in 1901, none were built until 1936, by which time C.B. Collett was in charge at Swindon. He took the Churchward proposal, and modified the design of the cab and controls to the then current style.
The 4300 Class of 2-6-0 tender locomotives had been introduced in 1911, and by 1932 there were 342 in service. With train loads and hence weights rising, these smaller, older and less powerful locomotives were scheduled to be replaced by new 4-6-0 locomotives by the 1930s.
The Granges were effectively a smaller-wheeled version of the GWR Hall Class. The GWR also built a lighter version of the Granges, the GWR 7800 Class, known as the Manor Class, which had smaller boilers. Between 1936 and 1939, 100 of the 4300 Class were taken out of service, and stripped of their parts at Swindon Works. The initial plan was to rebuild 80 as the 6800 Grange Class, whilst the remaining 20 were of the 7800 Manor Class. It had eventually been intended to replace all of the 4300 Class in this way in three batches, with the next Grange due to be built No. 6880 Betton Grange, to be named after the manor house in the Shropshire hamlet of Betton Strange. However, the onset of Second World War stopped the programme.
...
Wikipedia