GWR 7800 Class

GWR 7800 “Manor” Class

7802 "Bradley Manor", one of the nine preserved locomotives of the original 30 in the class.
Type and origin
Power type Steam
Builder GWR/BR Swindon Works
Order number Lot 316, Lot 377
Build date 1938–1939, 1950
Total produced 30
Specifications
Configuration 4-6-0
UIC class 2'Ch2
Gauge 4 ft 8 1⁄2 in (1,435 mm)
Leading dia. 3 ft 0 in (914 mm)
Driver dia. 5 ft 8 in (1,727 mm)
Minimum curve 8 chains (528 ft; 161 m) normal,
7 chains (462 ft; 141 m) slow
Wheelbase Loco: 27 ft 1 in (8.26 m)
Loco & tender: 52 ft 1 3⁄4 in (15.89 m)
Length 61 ft 9 1⁄4 in (18.83 m)
Height 13 ft 0 in (3.96 m)
Axle load 17 long tons 5 cwt (38,600 lb or 17.5 t)
Loco weight 68 long tons 18 cwt (154,300 lb or 70 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		 22.1 sq ft (2.05 m2)
Boiler GWR type 14
Boiler pressure 225 psi (1.55 MPa)
Heating surface:
 • Tubes and flues		 1,285.5 sq ft (119.43 m2)
 • Firebox 140.0 sq ft (13.01 m2)
Superheater:
 ​
 • Heating area 160.0 sq ft (14.86 m2)
Cylinders Two, outside
Cylinder size 18 in × 30 in (457 mm × 762 mm)
Performance figures
Tractive effort 27,340 lbf (121.61 kN)
Career
Operators Great Western Railway
British Railways
Class GWR: 7800 “Manor”
Power class GWR: D
BR: 5MT
Number in class 30
Axle load class GWR: Blue
Retired April 1963 – December 1965
Disposition 21 scrapped, 9 preserved

The Great Western Railway (GWR) 7800 Class or Manor Class is a class of 4-6-0 steam locomotive. They were designed as a lighter version of the GWR Grange Class, giving them a wider Route Availability. Like the 'Granges', the 'Manors' used parts from the GWR 4300 Class Moguls but just on the first batch of twenty. Twenty were built between 1938 and 1939, with British Railways adding a further 10 in 1950. They were named after Manors in the area covered by the Great Western Railway. Nine are preserved.

Background

Although successful mixed traffic designs, neither the Hall nor the Grange 4-6-0 classes were able to cover the full range of duties previously undertaken by the 4300 Class 2-6-0 locomotives due to their ‘red’ weight classification. By the late 1930s a lighter version of the Grange class was urgently required for those cross-country and branch line duties forbidden to heavier locomotives. [1] A new lighter (Swindon No.14) boiler was therefore designed, and as with the Grange Class, the driving wheels and motion components were recovered from withdrawn members of the 4300 Class.[2] The Manor class, with an axle loading of just over 17 tons, could be utilised on many lines from which the heavier Granges were barred [3]

Building

The first of the Manors No.7800 Torquay Manor was built at Swindon Works and entered traffic in January 1938. By February 1939 twenty were in service but outbreak of war forced the cancellation of construction of a further batch of twenty locomotives. After nationalisation, the newly created Western Region of British Railways was authorised to build ten more of the class. Nos.7820-29 at Swindon in November and December 1950.

Performance

Unlike the Granges of 1936 where the use of a standard design and the re-use of existing components had produced a masterpiece, the initial performance of the Manors was comparatively mediocre. ‘Were it not for the constraints of war there is every reason to expect that Swindon would have recalled the engines for modifications’[4] There was no attempt to improve the steaming; a British Railway edict permitted construction only of existing pre-nationalisation designs. Subsequent trials showed the engines did not require too much work to correct their faults. Internal alterations to the blastpipe and an increase in air space in the firegrate added to the new type of narrow chimney noticeably improved the draughting. After trials on ten of the class, the improvements became standard after July 1954.

Use

The first examples were despatched to depots at Wolverhampton, Bristol, Gloucester, Shrewsbury, Westbury in Wiltshire and Neyland in South Wales. In October 1938 No.7805 Broome Manor underwent clearance tests between Ruabon and Barmouth. Subsequently the class were used over the main lines of the erstwhile Cambrian Railways, with its headquarters and works in Oswestry. The Manors were also successfully employed in the West Country where they were used for banking and piloting trains over the Devon banks between Newton Abbot and Plymouth. Their light axleloading also allowed them across the Tamar Bridge and on to the branch lines of Cornwall. [5]

By 1959 twenty-one Manors were congregated in Mid- and South Wales. Their most prestigious working was the Cambrian Coast Express, where a Manor took over from a King or Castle at Shrewsbury and worked through to Aberystwyth. Others of the class operated in the Birmingham, Gloucester and Hereford areas while the handful stationed at Reading frequently ventured on to the Southern Region line to Guildford and Redhill. [6]

Withdrawal and Preservation

The first Manor to be withdrawn was No.7809 Childrey Manor, of Shrewsbury depot in April 1963 and which was cut up at Swindon. By May 1965 the numbers had been halved and the final two in service, No.7808 Cookham Manor of Gloucester, and No.7829 Ramsbury Manor of Didcot, were condemned in December 1965. Remarkably, for a relatively small class where thirty engines were built, nine examples have been preserved.

Operation in preservation

All nine members of the manor class that have survived into preservation have operated at some point in their preserved career and of the nine manors to survive in preservation, all four of the GWR built Manors have seen main line operation: Nos. 7802 Bradley Manor, 7808 Cookham Manor, 7812 Erlestoke Manor and 7819 Hinton Manor.

In the 1970s, no. 7808 Cookham Manor was used by the Great Western Society (GWS) to haul nine vintage ex-GWR carriages on an annual outing on the main line from Didcot to Birmingham. Today 7808 is on static display inside the GWS shed at Didcot awaiting an overhaul.

7812 Erlestoke Manor only worked a small number of railtours in the 1980s. Also certified for mainline operation in the 1980s was fellow SVR based engine 7819 Hinton Manor. She worked a number of railtours along former Great Western routes including the famous Cambrian Coast Line. Both engines also saw use in 1985 during the 150th anniversary of the Great Western Railway with the latter hauling most of the railtours of the 2 engines. During one run in Apr 1985 when 7819 double headed with GWR 6000 King George V After 6000 was failed at Taunton due to an overheated axle box 7819 was tasked with hauling the train onto Plymouth alone, this plan however backfired after 7819 was failed at Exeter due to a hot box. She however was repaired overnight and worked back to Bristol the following day. This was a part of the Severn Valley Railway's significant mainline operations at that time. 7812 is currently operational on the SVR and 7819 is on static display in Swindon.

7802 "Bradley Manor" was the last and most recent member of the class to have operated on the national network. Despite being only halfway through its period of mainline certification, Bradley Manor did not run on the national network beyond 2007. This was because from April 2007 new Network Rail standards were introduced, requiring all preserved steam locomotives operating on the mainline to be fitted with on-train monitoring recorders/black boxes (OTMR) before the end of 2007. Because it was not planned to put Bradley Manor back on the national network after it's then mainline certificate expired, and because the Erlestoke Manor Fund, its owner was dedicating its finances to the overhaul of the other Manor in its care, it was decided to withdraw Bradley Manor from working on the mainline. Bradley Manor did however operate for a grace period until the end of 2007. She is now operational on the Severn Valley Railway after emerging from a complete overhaul in Nov 2015.

None of the BR built manors have operated on the mainline in preservation & beyond 2008 no manors have operated on the national network, and as of 2016 there are no immediate plans currently in place to alter that situation.

Locomotives

See List of GWR 7800 Class locomotives for all Manor locomotives built. Nine locomotives have been preserved:

Number Name Base Current Location Owner Status Photo
7802 Bradley Manor Severn Valley Railway Severn Valley Railway Erlestoke Manor Fund Operational
7808 Cookham Manor Didcot Railway Centre Didcot Railway Centre Great Western Society Static Display
7812 Erlestoke Manor Severn Valley Railway Severn Valley Railway Erlestoke Manor Fund Operational
7819 Hinton Manor Severn Valley Railway Swindon Designer Outlet SVR Rolling Stock Trust Static Display
7820 Dinmore Manor Gloucestershire Warwickshire Railway Gloucestershire Warwickshire Railway Dinmore Manor Locomotive Ltd. Operational
7821 Ditcheat Manor West Somerset Railway STEAM Museum Swindon West Somerset Railway Association Static Display
7822 Foxcote Manor Llangollen Railway Llangollen Railway Foxcote Manor Society Operational
7827 Lydham Manor Dartmouth Steam Railway Dartmouth Steam Railway Dart Valley Railway plc Operational
7828 Odney Manor West Somerset Railway West Somerset Railway West Somerset Railway Operational

Details

7802 Bradley Manor at Kidderminster Town railway station after a southbound Severn Valley Railway journey from Bridgnorth.
Boiler maximum dia. 5 feet 3 inches (1.60 m)
Boiler minimum dia. 4 feet 7 5⁄8 inches (1.413 m)
Boiler length 13 feet 0 5/16 inches
Fire tubes, no. and dia. 158 × 2 inches (51 mm)
Flue tubes, no. and dia. 12 × 5 1⁄8 inches (130 mm)
Superheater tubes, no. and dia. 72 × 1 inch (25 mm)

Models

Ixion manufacture a model of the 78xx in N scale.

As of 17 November 2011 Dapol purchased the rights to produce the Ixion 78xx.

In 4 mm scale a model has been available from Bachmann, although it is not in the current range.

References

  1. ↑ le Fleming 1962, p. H36
  2. ↑ Herring, Peter (2004). Classic British Steam Locomotives. Wigston: Abbeydale Press. p. 140. ISBN 1 86147 138 6.
  3. ↑ Holcroft 1971, p. 156
  4. ↑ Herring (2004), p.140.
  5. ↑ Herring (2004), pp.140-141.
  6. ↑ Herring (2004), p.141.

External links

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