SR Q class

SR Q class[1]
30541 at Guildford shed, 1963
Type and origin
Power typeSteam
DesignerRichard Maunsell
BuilderSR Eastleigh Works
Build date1938–1939
Total produced20
Specifications
Configuration:
 • Whyte0-6-0
 • UICC h2
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Driver dia.5 ft 1 in (1.549 m)
Length53 ft 9+12 in (16.40 m)
Width8 ft 4 in (2.54 m)
Height12 ft 10 in (3.91 m)
Loco weight49 long tons 10 cwt (110,900 lb or 50.3 t) (55 short tons)
Tender weight40 long tons 10 cwt (90,700 lb or 41.1 t) (45 short tons)
Total weight90 long tons 0 cwt (201,600 lb or 91.4 t) (101 short tons)
Fuel typeCoal
Fuel capacity5 long tons (5.1 tonnes; 5.6 short tons)
Water cap.3,500 or 4,000 imp gal (15,900 or 18,200 L; 4,200 or 4,800 US gal)
Boiler pressure200 lbf/in2 (13.79 bar; 1.38 MPa)
CylindersTwo, inside
Cylinder size19 in × 26 in (483 mm × 660 mm)
Performance figures
Tractive effort26,160 lbf (116.37 kN)
Career
Operators
ClassSR: Q
Power classBR: 4F
Numbers
  • SR: 530–549
  • BR: 30530–30549
LocaleSouthern Region
Withdrawn1962–1965
DispositionOne preserved, remainder scrapped

The Q Class is a type of 0-6-0 steam locomotive designed by Richard Maunsell of the Southern Railway and constructed immediately prior to the Second World War for use on medium-distance freight trains throughout the network. Twenty locomotives were built by Maunsell's successor, Oliver Bulleid, in 1938. The design was relatively old-fashioned and the class was soon afterwards eclipsed by Bulleid's own more powerful Q1 class. Nevertheless the locomotives performed adequately and reliably on the tasks for which they had been designed, until their withdrawal in 1965. Only one has survived, and is preserved on the Bluebell Railway.

Background

The Southern Railway was primarily a passenger-carrying railway which used most of its resources to extend its electrified lines. There was a continuing need for steam freight locomotives however, although the Traffic Department preferred mixed-traffic designs which could also haul passenger trains on the remaining non-electrified lines at peak periods. By the late 1930s, the Southern Railway was adequately served with powerful mixed traffic locomotives of the S15, N, and N1 classes, but there was a need for a smaller freight locomotive with high route availability that could also undertake light passenger duties. This role had been performed by the ex-LSWR 'Jubilee' A12 0-4-2, which were approaching the end of their useful lives.[2][3]

During his last year as the Chief Mechanical Engineer (CME) of the Southern Railway, Richard Maunsell decided on an inside-cylinder 0-6-0 tender locomotive to undertake this role, in what was to become the Q Class of 1938.[4] This was a relatively ‘old-fashioned’ design for the late 1930s, although each of Britain's major railways built locomotives of this pattern until the 1940s. The class nevertheless contained several ‘modern’ features such as a Belpaire firebox, a superheater and a side-window cab.[5] It was the last Southern steam locomotive design before the Second World War, and represented the final design of Maunsell's career, as he retired due to ill-health in 1937.[citation needed]

Construction history

Maunsell's successor, Oliver Bulleid, oversaw the building of twenty members of the class at Eastleigh Works between January 1938 and September 1939. Bulleid is reported to have found the Q class uninspiring, having been manufactured to traditional Victorian principles of locomotive design, and is said to have stated that the order for the Q Class would have been cancelled if he had been appointed CME earlier.[6] However, Bulleid had ample opportunity either to cancel the order or to build and test a single prototype, without incurring the expense of building twenty members of the class, if this was the case.[7]

The class performed adequately and reliably on the tasks for which they were designed, but were less versatile than might have been hoped. When the requirement for modern freight locomotives on the Southern increased during the Second World War, Bulleid was faced with the options of continuing production of the Q Class, or designing a completely new locomotive. Taking the latter option, Bulleid designed what was to become the highly utilitarian SR Class Q1 0-6-0 locomotives.[2]

Modifications

No. 30537 (fitted with Lemaitre blast-pipe and chimney) at Norwood Locomotive Depot 12 March 1960.

In common with most Maunsell designs, the Q Class locomotives were reliable; but there were complaints of poor steaming when used on main-line trains (for which they were never designed). In 1940 Bulleid fitted one member of the class with a Lemaître blast pipe in an attempt to improve efficiency. This proved to be successful and the remainder of the class were so fitted between 1946 and 1949.[7] During the 1950s further experiments were carried out with the fitting of a British Railways Standard Class 4 plain blast pipe and small stovepipe chimney to no. 30549 in 1955, resulting in further improvements in both steaming and fuel consumption; in 1958–61 more received the same blast pipe with a BR Standard Class 4 chimney.[8][9]

Operational details and preservation

The locomotives were adequate and reliable on secondary services throughout their working lives, their utility compounded by their light weight and steady handling.[1] They were however disappointing on main-line traffic until the draughting was improved after the war. They were fitted with steam carriage heating, and despite being primarily a freight design, periodically deputised in this duty.[2]

British Railways inherited the class in 1948 and gave it a 4F power classification, F denoting a freight locomotive in power class 4.[9] Withdrawals from service began during 1962 and were completed by 1965.[citation needed] Loco 30548 served more than 15 years at Bournemouth shed (71B).[relevant?]

Preservation

30541 running round at Sheffield Park

The class was not considered sufficiently important for official preservation, and had it not been for Woodham Brothers's scrapyard in Barry, South Wales, no examples would have survived. Only one, number 541 (BR No. 30541), was rescued, and has operated on the Bluebell Railway in Sussex. It is operational in BR Black livery after returning to service in April 2015 (following its absence since 1993).[citation needed]

Livery and numbering

Southern Railway

Due to its primary role as a freight locomotive, the Q Class carried the Southern Black livery. The locomotive number and "Southern" were located on the tender, and were painted in Sunshine Yellow.[10] The numbering of the locomotives under the Southern Railway ranged from 530 to 549. Even though they were built under the tenure of Bulleid, the locomotives never followed his adaptation of the UIC classification system which refers to the number of leading, trailing and driving axles – in this case three. Under this system, this class would have had the prefix "C" before the numbers, such as C30. In the event this form of numbering was applied to Bulleid's Q1 Class locomotives of 1942.[citation needed]

Post-1948 (nationalisation)

Early livery included the temporary retention of the Southern number and remained black, although in certain cases "British Railways" was applied to the tender in place of "Southern", in Sunshine Yellow. Under British Railways the class was given the power classification 4F. Immediately after nationalisation the Q Class was given a temporary "S" prefix to the original Southern Railway number. As overhauls and re-paints became due, the class was eventually re-numbered within the British Railways standard numbering system and the livery was changed to British Railways goods plain black with the crest on the tender and numbering on the side of the cab. These locomotive numbers ranged from 30530 to 30549.[11][page needed]

Locomotive summary

References

Notes

  1. ^ a b Haresnape 1977, p. 112.
  2. ^ a b c Scott-Morgan 2003, p. 9.
  3. ^ Bradley 1975, pp. 54–59.
  4. ^ Haresnape 1977, p. 115.
  5. ^ Bradley 1975, pp. 54–58.
  6. ^ Maunsell Q class 0-6-0, Southern E-Group, 17 March 2004. Retrieved 18 April 2007. For information on Bulleid's dislike of the design.
  7. ^ a b Bradley 1975, p. 55.
  8. ^ Bradley 1975, p. 58.
  9. ^ a b Banks 2001, p. 54.
  10. ^ Haresnape 1977, p. 114.
  11. ^ Ian Allan ABC, 1962

Bibliography

  • Banks, Chris (2001), BR Locomotives 1955, Oxford: Oxford Publishing Company, ISBN 0-86093-560-4
  • Bradley, D.L. (October 1975), Locomotives of the Southern Railway. Part 1, London: Railway Correspondence and Travel Society, ISBN 0-901115-30-4
  • Haresnape, Brian (1977), Maunsell Locomotives - a pictorial history, Ian Allan Ltd, ISBN 0-7110-0743-8
  • Longworth, Hugh (2005), British Railway Steam Locomotives: 1948–1968, Oxford: Oxford Publishing Company, ISBN 0-86093-593-0
  • "New 0-6-0 goods engines for the Southern Railway", Railway Magazine, 82, 1938
  • Scott-Morgan, John (2003), The Story of the Q1s, Bishop's Waltham: KRB Publications, ISBN 0-9544859-1-2
  • Ian Allan ABC of British Railways Locomotives (1962 ed.).

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