The BR Standard Class 7,
otherwise known as the ''Britannia'' Class, is a class of
4-6-2 ''Pacific'' steam locomotive
A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomot ...
designed under
Robert Riddles
Robert Arthur "Robin" Riddles, CBE, MIMechE, MinstLE (23 May 1892 – 18 June 1983) was a British locomotive engineer.
Biography LNWR and LMS
Riddles was born in 1892 and entered the Crewe Works of the London and North Western Railway as a pre ...
for use by
British Railways
British Railways (BR), which from 1965 traded as British Rail, was a state-owned company that operated most of the overground rail transport in Great Britain from 1948 to 1997. It was formed from the nationalisation of the Big Four British rai ...
for
mixed-traffic duties. 55 were constructed between 1951 and 1954. The design employed results from the 1948 locomotive exchanges undertaken in advance of further locomotive classes being constructed. Three batches were constructed at Crewe Works, before the publication of the
1955 Modernisation Plan
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.
The ''Britannia'' Class design was based on best practice from the pre-nationalisation railway companies in terms of operating efficiency and lower maintenance costs;
[Loco Profile 12, BR Britannias. Brian Haresnape. Profile Publications. 1971] various weight-saving measures also increased the
route availability of a ''Pacific''-type locomotive on the British Railways network. The ''Britannias'' received a positive reception from their crews, with those regularly operating the locomotives giving them favourable reports as regards performance.
However, operation in some areas of the British Railway network returned negative feedback, primarily due to indifferent operation of the locomotive, with its effects on adhering to timetables. They were capable of reaching speeds of up to 90 mph (145 km/h).
The ''Britannias'' took their names from great
Britons, former
Star class locomotives, and Scottish
firths.
The class remained in service until the last was withdrawn in 1968. Two survived into preservation, the first-of-class, number
70000 ''Britannia'', and
70013 ''Oliver Cromwell''. Number 70000 has hauled mainline excursions and 70013, after a period of display following limited steaming, returned to mainline steam in 2008 for the first time since leaving British Railways ownership. 70000 was returned to the main line in 2011.
Background
Locomotive exchanges were commissioned by the fledgling
British Railways
British Railways (BR), which from 1965 traded as British Rail, was a state-owned company that operated most of the overground rail transport in Great Britain from 1948 to 1997. It was formed from the nationalisation of the Big Four British rai ...
(BR) during 1948, to compare pre-
nationalisation
Nationalization (nationalisation in British English) is the process of transforming privately-owned assets into public assets by bringing them under the public ownership of a national government or state. Nationalization usually refers to pri ...
locomotive design across the ''Big Four'' railway companies.
The research gained from operating the best designs of the
GWR,
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* Leiomyosarcoma, a rare form of cancer
* Lenz ...
,
LNER and
Southern
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railways on different areas of the British Railways network paved the way for several new classes of standardised locomotives
intended to replace some of the ageing designs inherited.
The new classes were designed by
E. S. Cox, under Robert Riddles who had previously designed the
WD Austerity 2-8-0 and
WD Austerity 2-10-0 locomotives for wartime use. The first design requested by the
Railway Executive was for a new express passenger "
Pacific" locomotive, designed specifically to reduce maintenance and using the latest available innovations in steam technology from home and abroad. Various labour-saving devices were utilised to produce a simple, standard and effective design, able to produce equivalent power to some of the "Pacifics" that were still available as legacies of the Big Four.
Design features
The design of the "Britannias" was based on best practice from the pre-nationalisation railway companies.
For example, they utilised a variation of both
boiler and trailing truck of the
Merchant Navy class, while weight was kept within the margins laid down by the
Light Pacifics, all of which were designed by
Oliver Bulleid. The
firebox was also similar in having a
rocking grate, which allowed the fire to be rebuilt without stopping the locomotive, removing both ash and clinker on the move;
but unlike the SR Pacifics, the inner firebox was constructed of copper instead of steel and lacked
thermic syphons
Thermic siphons (alt. thermic syphons) are heat-exchanging elements in the firebox or combustion chamber of some steam boiler and steam locomotive designs. As they are directly exposed to the radiant heat of combustion, they have a high evapo ...
.
The "Britannias" had driving wheels, a compromise for their mixed-traffic role to allow sustained fast running with passenger trains, yet small enough to give sufficient tractive effort for
freight haulage.
The largest, only outside, cylinders capable of giving maximum tractive effort whilst staying within the British
loading gauge
A loading gauge is a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads. Their purpose is to ensure that rail vehicles can pass safely through tunnels and under bridges, and ke ...
were used for ease of maintenance compared with "inside" cylinders located between the frames of a three- or four-cylindered locomotive. Boiler 'plumbing' was also generally exposed to give ease of access. For ease of maintenance, outside
Walschaerts valve gear was used.
A self-cleaning
smokebox enabled ash to be ejected through the chimney, reducing the workload of the engine cleaner at the end of a working day. The single chimney was unusual for a "Pacific" type of locomotive, but was chosen because the exhaust dimensions including the
blastpipe were designed using work done at the
Rugby test plant and by
S.O. Ell at
Swindon Works, who claimed that "better results could be obtained from a well-designed single chimney than some of the previous double chimney arrangements".
The design also featured raised running plates above the wheels, which allowed easy access to the inside of the frames for purposes of lubrication.
The "Britannias'"
footplate was designed around the requirements of the operating crews, with a mock-up being constructed at Crewe to test ergonomics and usability.
No
exhaust steam injector was fitted, as this was frequently a troublesome item. Unlike the smaller BR Standard locos the exhaust steam manifold within the smokebox saddle (along with the BR Standard Class 6 engines) was an intricate steel casting.
Construction history
Designed at British Railways'
Derby Works, the new class was constructed at British Railways'
Crewe Works between 1951 and 1954. The initial order was for 25 locomotives, but such was the demand for the ''Britannias'' on the Eastern Region that more were rushed through construction before the teething problems had been ironed out on the prototypes.
In total, 55 members of the class were constructed over three batches at Crewe Works, where each was given improvements to improve reliability and efficiency, and to overcome flaws with the original design.
* First batch: 70000–70024, constructed between January and October 1951
* Second batch: 70025–70044, constructed between September 1952 and October 1953
* Third batch: 70045–70054, constructed in 1954.
Variations and modifications
Problems with the class were experienced immediately, with the first 25 locomotives being withdrawn in October 1951 after several complaints were received from crews regarding the driving wheels shifting on their axles.
They were subsequently modified, and released back into revenue-earning service. Initially the return cranks on the main driving wheels were of
LNER block type, as seen on
Arthur Peppercorn
Arthur Henry Peppercorn, (29 January 1889 – 3 March 1951) was an English railway engineer, and was the last Chief Mechanical Engineer (CME) of the London and North Eastern Railway.
Career
Arthur Peppercorn was born in Leominster in 1889 ...
's
A1s and
A2s, but this was changed to the simpler
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* Labeled magnitude scale, a scaling technique
* Learning management system, education software
* Least mean squares filter, producing least mean square error
* Leiomyosarcoma, a rare form of cancer
* Lenz ...
four-stud fitting.
This was the result of a problem of overheating bearings within the cranks, and difficulty in removing the LNER-type casings.
70035–70039 were built with roller bearings on the leading and trailing coupled axles only and plain bearings on the remaining axles, whilst 70040–70049 were built with plain bearings throughout. However throughout their service the roller bearings used in remaining cases showed no advantage in reliability or cost.
An unusual fault with the first engines of the class was fore-and-aft vibration, strong enough to prompt passengers to complain and to cause fire-irons stowed in a longitudinal compartment on top of the tender to work their way forward into the cab. The passengers' complaints were dealt with by reducing the tension in the drawbar spring.
Locomotive tenders were also changed as new, improved designs became available. Some examples of the second batch (70025–70029) were equipped with the BR1A tender, which had a higher water capacity of 5,000 gallons. Members of the third batch (70045–70054) were equipped with another tender design, the BR1D, which had 9 tons of coal and 4,750 gallons of water, due to the fact that they were intended for use on longer runs in the north of the railway network. This tender design also featured a steam-powered coal pusher, which eliminated the need for crew members to mount the tender to pull forward coal when the locomotive was at a stop.
Nos.70043 and 70044 were delivered with Westinghouse airbrakes fitted alongside the smokebox and with no smoke deflectors. The two locomotives, which looked radically different from the rest of the class, were allocated to Manchester (Longsight) and ran a series of brake trials on the London Midland main line during the mid-1950s. Subsequently, both had the equipment removed and deflectors fitted.
No. 70045 was fitted with LMS-style oval buffers in the course of repairs after collision damage.
On 21 January 1960, the
Settle rail crash, which cost the lives of five passengers, was caused when the piston rod, cross-head and connecting rod of No. 70052 came loose and damaged the opposite line as a freight train was approaching. The locomotive of the freight train was derailed towards 70052's train and tore out the sides of three passenger coaches. Part of the slide assembly was redesigned, and was fitted as the locomotives were routinely "shopped".
Western Region based examples had hand/foot holds cut into the smoke deflectors replacing the original handrails after
a major derailment, to improve forward visibility. Some of these deflectors subsequently migrated to other members of the class.
Naming
From 1948 until the mid-1950s, the responsibility for recommending names for locomotives on British Railways rested with a Locomotive Naming Committee of three senior railway officers, E. S. Cox,
George Dow with
Derek Barrie
Derek is a masculine given name. It is the English language short form of ''Diederik'', the Low Franconian form of the name Theodoric. Theodoric is an old Germanic name with an original meaning of "people-ruler".
Common variants of the name are ...
as chairman.
The Committee set itself several rules and over the years developed many practices. The names had to be euphonious (they had to have a pleasant sound). Also, their meaning had to be readily apparent to anyone interested, whether railwayman or member of the public. There had to be good publicity value in the names as well as providing good morale for the staff, and the collection of names for a class had to provide some form of class identity. Another rule was not to use names of people who were still alive at the time, and some on the Committee had a strong dislike of names or associations with the military (largely because they were fed-up with the recently ended war). There was a preference for names of heroes and other well-known people. However, slavishly following a single theme to an absurd extent was discouraged.
The name that was to be bestowed on the first class member caused great debate on the Committee and the wider executive of British Railways. However noted enthusiast
Bishop Eric Treacy suggested the name "Britannia".
This set the general theme of the naming process, which featured great Britons, although several deviations from the theme were allowed. These exceptions were allocated to those that operated on the Western Region, which were given names of former
Star Class locomotives, and those of the Scottish Region, which were granted the names of the various Scottish
firths.
The locomotive naming ceremonies were carried out at various
railway stations around the British Railways network. No. 70047 was never named.
Operational details
The class was well liked by crews in most regions of British Railways, with especially glowing reports from those operating them from Stratford depot on the Eastern Region, where its lower weight and high power transformed motive power over the restricted
East Anglian lines. However, negative feedback was received from various operating departments, most notably on the Western Region. The criticism was primarily out of partisan preference for GWR-designed locomotive stock among Western Region staff;
[Derry, Richard. ''The Book of The Britannia Pacifics'', Irwell Press, published 2004 ] in particular, the class was 'left-hand drive' in contrast to 'right-hand drive' GWR locomotive and signalling practice, a factor in the
Milton rail crash of 1955.
For this reason, the Western Region locomotive depots at
Old Oak Common TMD and
Plymouth Laira declared that the class was surplus to requirements.
However
Cardiff Canton depot displayed its liking for the class (despite being part of the former GWR empire) and managed to obtain good results on
South Wales
South Wales ( cy, De Cymru) is a loosely defined region of Wales bordered by England to the east and mid Wales to the north. Generally considered to include the historic counties of Glamorgan and Monmouthshire, south Wales extends westwards ...
passenger traffic.
The London Midland Region also had favourable reports, but a marked consistency in losing time on the longer runs between
Holyhead
Holyhead (,; cy, Caergybi , "Cybi's fort") is the largest town and a community in the county of Isle of Anglesey, Wales, with a population of 13,659 at the 2011 census. Holyhead is on Holy Island, bounded by the Irish Sea to the north, and is ...
and
Euston was recorded, although all complaints were down to the individual techniques of the operating crews.
This was compounded by the irregular allocation of the class to depots all over the network, meaning that few crews ever had a great deal of experience in driving them.
The Southern Region also had an allocation of seven in May 1953, when all Merchant Navy Class locomotives were temporarily withdrawn for inspection after 35020 "Bibby Line" sheared a crank axle on the central driving wheel.
Repairs to the class were undertaken at Crewe, Swindon and
Doncaster Works until the financial constraints of the British Railways
Modernisation Plan in terms of expenditure on steam began to preclude the regular
overhaul of locomotives.
[ During the mid-1960s overhauls were carried out exclusively at Crewe Works. The first locomotive to be withdrawn from service was number 70007 "Coeur-de-Lion" in 1965, and the entire class was gradually transferred to ]Carlisle
Carlisle ( , ; from xcb, Caer Luel) is a city that lies within the Northern England, Northern English county of Cumbria, south of the Anglo-Scottish border, Scottish border at the confluence of the rivers River Eden, Cumbria, Eden, River C ...
Kingmoor and Glasgow Polmadie depots as steam was displaced by the dieselisation of British Railways. Some members of this class were a common sight in the Cumbrian main line, pulling both passenger trains and parcel trains in Grange-over-Sands, Barrow-in-Furness, Preston
Preston is a place name, surname and given name that may refer to:
Places
England
*Preston, Lancashire, an urban settlement
**The City of Preston, Lancashire, a borough and non-metropolitan district which contains the settlement
**County Boro ...
, and other locations in the area. A succession of bulk withdrawals began in 1967, and the last, of number 70013 "Oliver Cromwell", took place in 1968, at the very end of steam operation in Britain.[ Subsequently, that locomotive was selected to represent the class in the ]National Collection
The UK National Collection is a collection of around 280 historic rail vehicles (predominantly of British origin). The majority of the collection is kept at four national museums:
* National Railway Museum, York
* Locomotion, Shildon
* Science ...
. Only 70000 "Britannia", which was privately preserved, saw main line service during the preservation era – until 2008, when 70013 "Oliver Cromwell"'s restoration was completed, and she worked part of the "15 Guinea Special" – a special train run to commemorate the final BR steam working in 1968. 70013 is now to be found operating main line railtours over the Network Rail system.
Accidents and incidents
:
*On 20 November 1955, locomotive No. 70026 ''Polar Star'' was hauling an excursion train that was derailed at Milton
Milton may refer to:
Names
* Milton (surname), a surname (and list of people with that surname)
** John Milton (1608–1674), English poet
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, Oxfordshire
Oxfordshire is a ceremonial and non-metropolitan county in the north west of South East England. It is a mainly rural county, with its largest settlement being the city of Oxford. The county is a centre of research and development, primarily ...
due to excessive speed through a crossover. Eleven people were killed and 157 were injured.
*On 21 January 1960, locomotive No. 70052 ''Firth of Tay'' was hauling an express passenger train that was derailed at Settle, Yorkshire due to a defect on the locomotive. Five people were killed and nine were injured.
*On 5 June 1965, locomotive 70051 ''Firth of Forth'' was hauling a passenger train when a blowback of the fire occurred near . Driver Wally Oakes managed to safely bring the train to a stand, but both he and fireman Gwilym Roberts were severely injured. Oakes died a week later. He was awarded the George Cross
The George Cross (GC) is the highest award bestowed by the British government for non-operational gallantry or gallantry not in the presence of an enemy. In the British honours system, the George Cross, since its introduction in 1940, has been ...
and the Carnegie Hero Trust bronze medal for his actions. Class 86 locomotive 86 260 was later named ''Wallace Oakes G.C.'' in his honour.
*On 30 July 1966, locomotive No. 70017 ''Arrow'' was hauling a set of empty coaches from Carlisle Citadel when it was derailed at Carlisle St Nicholas after a rear-end collision with a goods train on the Carlisle Joint Goods Line. The locomotive would later be withdrawn from service owing to the damage received in the accident and derailment.
*On 27 May 2012, locomotive No. 70013 ''Oliver Cromwell'' was involved in a blowback incident at Wood Green tunnel near New Southgate station
New Southgate railway station is on the boundary of the London Borough of Barnet and the London Borough of Enfield in north London, in Travelcard Zone 4. It is down the line from .
The station, and all trains serving it, have been operated by ...
in North London on a Railway Touring Company railtour called 'The Peak Forester'. Two of the three crew on board the locomotive had to attend hospital as a result. A Rail Accident Investigation Branch investigation was conducted after the accident.
Livery and numbering
The first member of the class was given a livery of plain black without lining; this was changed to the new standard British Railways Dark Locomotive Green that was applied to express passenger locomotives after nationalisation
Nationalization (nationalisation in British English) is the process of transforming privately-owned assets into public assets by bringing them under the public ownership of a national government or state. Nationalization usually refers to pri ...
, despite the locomotive being classed as mixed traffic. This was lined in orange and black, and the class was given the power classification 7MT. The "Britannias" were numbered under the new British Railways standard numbering system in the 70xxx series. The locomotives were numbered between 70000 and 70054, and featured brass nameplates with an initial black background, followed by red, located on the smoke deflectors. Towards the end of steam plain green livery was substituted, with the touching-up of existing paintwork being preferred to full aesthetic overhaul.
Preservation
Two ''Britannias'' have survived, the prototype engine number 70000 ''Britannia'', and 70013 ''Oliver Cromwell''. Both engines have also operated at certain points in preservation as well as both running on the mainline in preservation.
Number 70000 was originally selected to represent the class in the embryonic form of the future National Railway Museum, but was ultimately rejected due to the locomotive's poor mechanical condition. As a result, 70013 was eventually selected to represent the class for the benefit of future generations. However, 70000 had been purchased privately from British Railways by the Britannia Locomotive Group, which ensured that the doyen of the class was to survive into the preservation era. Subsequently utilised on mainline railtours, the locomotive was out of use in the late 1990s, requiring work to bring it back to steam; it was eventually sold to Pete Waterman and stored at Crewe. After a spell in storage on the Bressingham Steam Museum
Bressingham Steam & Gardens is a steam museum and gardens located at Bressingham (adjacent to a garden centre), west of Diss in Norfolk, England. The site has several narrow gauge rail lines and a number of types of steam engines and vehicles in ...
in Diss, Norfolk, 70013 was moved to the Great Central Railway (preserved), following an ownership dispute between Bressingham and the National Railway Museum. The locomotive returned to steam in May 2008 on the Great Central Railway after the readers of Steam Railway magazine contributed towards its overhaul. In July 2008 it appeared in WCRC's Open Weekend at Steamtown, Carnforth. August saw the locomotive return to the main line. Its first turn was the 1T57 ' Fifteen Guinea Special' re-run from Manchester to Carlisle, 40 years after it performed the same duty in 1968. As a result, both preserved members of the class have operated on the mainline in preservation.
After its sale to the Royal Scot Locomotive and General Trust, 70000 was overhauled at Crewe and returned to the main line in 2011 (its 60th anniversary), initially in unlined black without name plates as originally outshopped in 1951 (the plates were first fitted for the Festival of Britain later that year).
Gallery
File:Newport 3 railway station 2053163 ed78d1a1.jpg, No. 70029 'Shooting Star' with the Up Red Dragon express at Newport Station, 10 October 1958
File:70015 Apollo Lostock Hall MPD.jpg, 70015, without nameplates.
File:Basingstoke 2 Station geograph-2242279-by-Ben-Brooksbank.jpg, Basingstoke
File:Sanquhar with Glasgow - Carlisle stopping train geograph-2742700-by-Ben-Brooksbank.jpg
File:Birmingham New Street Station, east end, with 'Britannia' Pacific geograph-2742656-by-Ben-Brooksbank.jpg
File:London victoria 2052605 b6a388dc.jpg, 70004 With ''Golden Arrow''
See also
* List of BR 'Britannia' Class locomotives
* BR standard class 7 70000 Britannia
* BR standard class 7 70013 Oliver Cromwell
References
Citations
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{{good article
7
4-6-2 locomotives
Railway locomotives introduced in 1951
Standard gauge steam locomotives of Great Britain
Mixed traffic locomotives