GWR 6000 Class
Encyclopedia
The Great Western Railway
Great Western Railway
The Great Western Railway was a British railway company that linked London with the south-west and west of England and most of Wales. It was founded in 1833, received its enabling Act of Parliament in 1835 and ran its first trains in 1838...

 6000 Class or King is a class of 4-6-0
4-6-0
Under the Whyte notation for the classification of steam locomotives, 4-6-0 represents the wheel arrangement of four leading wheels on two axles in a leading truck, six powered and coupled driving wheels on three axles, and no trailing wheels. This wheel arrangement became the second-most popular...

 steam locomotive
Steam locomotive
A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

 designed for express passenger work. With the exception of one Pacific (The Great Bear
GWR 111 The Great Bear
The Great Bear, number 111, was a locomotive of the Great Western Railway. It was the first 4-6-2 Pacific locomotive used on a railway in Great Britain, and the only one of that type ever built by the GWR.- History and operation :...

), they were the largest locomotives the GWR built. They were named after kings of the United Kingdom and of England, beginning with the reigning monarch, King George V
George V of the United Kingdom
George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 through the First World War until his death in 1936....

, and going back through history. Following the death of King George V, the highest-numbered engine was renamed after his successor; and following the abdication of the latter, the next-highest engine was also renamed after the new King.

Background

This class was designed under the direction of C. B. Collett
Charles Collett
Charles Benjamin Collett was chief mechanical engineer of the Great Western Railway from 1922 to 1941. He designed the GWR's 4-6-0 Castle and King Class express passenger locomotives.-Career:...

, as an enlarged version of Collett's Castle Class
GWR 4073 Class
The GWR 4073 Class or Castle class locomotives are a group of 4-6-0 steam locomotives of the Great Western Railway. They were originally designed by the railway's Chief Mechanical Engineer, Charles Collett, for working the company's express passenger trains.-History:A development of the earlier...

, which in turn was an enlargement of George Jackson Churchward
George Jackson Churchward
George Jackson Churchward CBE was Chief Mechanical Engineer of the Great Western Railway in the United Kingdom from 1902 to 1922.-Early career:...

's Star Class
GWR 4000 Class
A Star class locomotive was a particular type of steam locomotive of the Great Western Railway. The prototype was an experimental locomotive, North Star , constructed with the 'Atlantic' 4-4-2 wheel arrangement for comparative trials with 4-cylinder compound locomotives of the de Glehn type that...

. Churchward had proposed fitting the 6ft diameter boiler used on his 4700 Class
GWR 4700 Class
The Great Western Railway 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...

 2-8-0
2-8-0
Under the Whyte notation for the classification of steam locomotives, 2-8-0 represents the wheel arrangement of two leading wheels on one axle , eight powered and coupled driving wheels on four axles, and no trailing wheels...

 on to a 4-6-0
4-6-0
Under the Whyte notation for the classification of steam locomotives, 4-6-0 represents the wheel arrangement of four leading wheels on two axles in a leading truck, six powered and coupled driving wheels on three axles, and no trailing wheels. This wheel arrangement became the second-most popular...

 chasis in 1919 to create a more powerful express locomotive, but had been prevented from doing so due to weight restrictions on several bridges on the GWR main line. Collet's Castle class of 1923 was therefore a compromise with a 5' 6" boiler. However, bridge strengthening and a better understanding of the impact of hammer blow
Hammer blow
Hammer blow, in rail terminology, refers to the vertical forces transferred to the track by the driving wheels of a steam locomotive and some diesel locomotives. The largest proportion of this is due to the unbalanced reciprocating motion, although the piston thrusts also contribute a portion to it...

 on structures brought about by the work of the 'Bridge Stress Committee' set up by the Department of Scientific and Industrial Research led to the relaxation of these restrictions.

The new design was partly to meet future traffic requirements, but was also a response to the Great Western Railway
Great Western Railway
The Great Western Railway was a British railway company that linked London with the south-west and west of England and most of Wales. It was founded in 1833, received its enabling Act of Parliament in 1835 and ran its first trains in 1838...

 publicity department's desire to regain the title of having the 'most powerful express passenger steam locomotive in Britain', which had been taken from the Castle Class in 1926 by the Southern Railway Lord Nelson Class
SR Lord Nelson Class
The SR class LN or Lord Nelson class is a type of 4-cylinder 4-6-0 steam locomotive designed for the Southern Railway by Richard Maunsell in 1926. They were intended for Continental boat trains between London and Dover harbour, but were also later used for express passenger work to the South-West...

. The engines, as originally designed, delivered 39700 lbf (176,594.4 N) tractive effort
Tractive effort
As used in mechanical engineering, the term tractive force is the pulling or pushing force exerted by a vehicle on another vehicle or object. The term tractive effort is synonymous with tractive force, and is often used in railway engineering to describe the pulling or pushing capability of a...

, with 16-inch bore by 28-inch stroke cylinders and 250 pound per square inches (1.72 MPa) boiler. At a request from Sir Felix Pole
Felix Pole
Sir Felix John Clewett Pole was a British railway manager and industrialist. He was general manager of the Great Western Railway , before becoming executive chairman of Associated Electrical Industries, a post he held until 1945.-References:...

, the Great Western
Great Western Railway
The Great Western Railway was a British railway company that linked London with the south-west and west of England and most of Wales. It was founded in 1833, received its enabling Act of Parliament in 1835 and ran its first trains in 1838...

's General Manager, to get the tractive effort up to above 40,000 lbf (a major goalpost), the cylinders were enlarged to -inch bore, bringing the figure up to 40300 lbf (179,263.3 N). This increase was removed on all members of the class at their first major overhaul. The distinctive design of the leading bogie
Bogie
A bogie is a wheeled wagon or trolley. In mechanics terms, a bogie is a chassis or framework carrying wheels, attached to a vehicle. It can be fixed in place, as on a cargo truck, mounted on a swivel, as on a railway carriage/car or locomotive, or sprung as in the suspension of a caterpillar...

 (with outside bearings on the fore wheel and inside bearings on the rear wheel) was to allow for these larger cylinders.

The first, No. 6000 King George V
GWR 6000 Class 6000 King George V
thumb|right|6000 King George V at Swindon having just hauled the last King-hauled train from Wolverhampton and Birmingham Snow Hill . Note the bell which was given to the engine when it toured the U.S...

, appeared in 1927 and was sent on a tour of North America, for the Centenary celebrations of the Baltimore and Ohio Railroad
Baltimore and Ohio Railroad
The Baltimore and Ohio Railroad was one of the oldest railroads in the United States and the first common carrier railroad. It came into being mostly because the city of Baltimore wanted to compete with the newly constructed Erie Canal and another canal being proposed by Pennsylvania, which...

 (B&O), where its sleek appearance and smooth performance impressed all who witnessed it. The application of pressurised oil lubrication showed its advantages over the largely grease-lubricated American Locomotives, and was even incorporated into a later design for the B&O in 1928. King George V was presented with a brass bell to mark the occasion. The original scheme for the Kings had been to name them after cathedrals, but when the US trip was planned it was felt that a more unmistakably British icon was needed. During planning and construction the engine was dubbed the 'Super-Castle'.

They were engines to be reckoned with, powering the Western Region
Western Region of British Railways
The Western Region was a region of British Railways from 1948. The region ceased to be an operating unit in its own right in the 1980s and was wound up at the end of 1992...

's crack expresses like the Cornish Riviera Limited
Cornish Riviera Express
The Cornish Riviera Express is a British express passenger train that has run between London and Penzance in Cornwall since 1904. Introduced by the Great Western Railway, the name Cornish Riviera Express has been applied to the late morning express train from London Paddington station to Penzance...

 up until the end of regular steam hauled express services on the WR.

An interesting fact is that although the railway claimed that the class was built in response to longer and heavier trains, it was several years after its introduction before the platforms at the company's major stations were lengthened to accommodate these trains. The class was restricted to the London-Taunton-Plymouth (via both Bristol
Bristol Temple Meads railway station
Bristol Temple Meads railway station is the oldest and largest railway station in Bristol, England. It is an important transport hub for public transport in Bristol, with bus services to various parts of the city and surrounding districts, and a ferry service to the city centre in addition to the...

 and ) and London-Birmingham-Wolverhampton (via Bicester
Bicester North railway station
Bicester North is a station on the Chiltern Main Line, one of two stations serving Bicester. Services operated by Chiltern Railways run south to and north to , and .Bicester North is the larger of Bicester's two stations...

) main lines, and even then, only after bridge strengthening had taken place, due to the engines' large boilers giving them a high axle weight of 22.5 LT. William Stanier
William Stanier
Sir William Arthur Stanier, FRS was Chief Mechanical Engineer of the London, Midland and Scottish Railway.- Biography :...

 based his LMS Princess Royal Class
LMS Princess Royal Class
The London, Midland and Scottish Railway Princess Royal Class is a class of an express passenger steam locomotive designed by William Stanier. They were Pacifics...

 design on the King Class, but with an enlarged boiler and firebox necessitating a 4-6-2 wheel arrangement.

In 1947 experiments had been made with a four-row high-degree superheater in No. 6022 King Edward III, owing to a decline in the availability of high-calorific South Wales steam coal, on which the GWR had always relied for its good locomotive performance. During the 1948 locomotive exchanges, King Henry VI had performed disappointingly using Yorkshire coal, despite demonstrating the 4-6-0 type's unique sure-footedness when climbing out of Kings Cross, where pacific types were apt to slip alarmingly. After this, four-row superheaters were fitted to the class, and modifications were also made to the draughting arrangement, using No. 6001 King Edward VII as a test-bed. From September 1955 double blast-pipes and chimneys were fitted, initially to No. 6015 King Richard III. Following successful testing the whole of the class was subsequently modified and, as a result, their final years in British Railways ownership saw the very best of their performance, particularly on the steep South Devon banks at Dainton, Rattery, and Hemerdon.

They were all withdrawn in 1962, replaced by the western region's short lived diesel-hydraulic Western locomotives.

Loco specification

Specification - GWR 6000 King Class
Boiler type Number 12 Boiler maximum dia. 6 in 0 in (1.83 m)
Boiler minimum dia. 5 foot Fire tubes, no. and dia. 171 x 2+1/4 in
Flue tubes, no. and dia. 16 x 5+7/8 in Superheater tubes, no. and dia. 96 × 1 inches (25 mm)
Boiler pressure 250 psi (1.72 MPa) Boiler length 16 in 0 in (4.88 m)
Area of firegrate 34.3 square feet (3.2 m²) Heating surfaces, tubes 2008 square feet (186.5 m²)
Heating surfaces, firebox 194 square feet (18 m²) Heating surfaces, superheater 313 square feet (29.1 m²)

List of King Class locomotives


Preservation

Under GWR operations, the King class were designed to the maximum mainline loading gauge
Loading gauge
A loading gauge defines the maximum height and width for railway vehicles and their loads to ensure safe passage through bridges, tunnels and other structures...

 specification, to allow for maximum power creation and resultant speed. This restricted them as to where they could operate under both GWR and British Railways ownership. Developments in high-speed rail from the 1970s mean that ballast depths have increased, resulting in a decrease in loading gauge height in the UK. This has started to be reversed with the introduction of pan-European loading gauge standards on some lines.

The present result of these civil engineering changes is that an original King locomotive would not pass through various points of the modern Network Rail
Network Rail
Network Rail is the government-created owner and operator of most of the rail infrastructure in Great Britain .; it is not responsible for railway infrastructure in Northern Ireland...

 system. Faced with a choice of either not operating their locomotives on the mainline or modifying to allow them to pass within the current UK loading gauge private societies choose to reduce the height of their locomotives by: reducing cab and chimney height and modifying some upper pipe work. The National Railway Museum, owners of 6000 King George V
GWR 6000 Class 6000 King George V
thumb|right|6000 King George V at Swindon having just hauled the last King-hauled train from Wolverhampton and Birmingham Snow Hill . Note the bell which was given to the engine when it toured the U.S...

, decided to keep this locomotive in its original condition and this restricts it to routes which have the original loading gauge, including preserved lines, however for various reasons it is a static exhibit only at present.
Number Image Name Owner Current location Current status
6000
King George V
GWR 6000 Class 6000 King George V
thumb|right|6000 King George V at Swindon having just hauled the last King-hauled train from Wolverhampton and Birmingham Snow Hill . Note the bell which was given to the engine when it toured the U.S...

National Railway Museum
National Railway Museum
The National Railway Museum is a museum in York forming part of the British National Museum of Science and Industry and telling the story of rail transport in Britain and its impact on society. It has won many awards, including the European Museum of the Year Award in 2001...

NRM York
National Railway Museum
The National Railway Museum is a museum in York forming part of the British National Museum of Science and Industry and telling the story of rail transport in Britain and its impact on society. It has won many awards, including the European Museum of the Year Award in 2001...

On static display. Only original King
6023
King Edward II
GWR 6000 Class 6023 King Edward II
Great Western Railway 6000 Class 6023 King Edward II is a preserved steam locomotive.The locomotive was built at GWR's Swindon works in June 1930. For most of its working life it was allocated to Newton Abbott and Laira . It was withdrawn from Cardiff in June 1962, and was sent to Swindon for...

Great Western Society
Didcot Railway Centre
Didcot Railway Centre
Didcot Railway Centre, located in the town of Didcot in the English county of Oxfordshire, is based around the site of a comprehensive "engine shed" which became redundant after the nationalisation of the UK railways, due to the gradual changeover from steam to diesel motive power.-Description:The...

Operational
6024
King Edward I
GWR 6000 Class 6024 King Edward I
Great Western Railway 6000 Class 6024 King Edward I is a preserved steam locomotive.The locomotive was built at GWR's Swindon Works in June 1930. For most of its working life it was allocated to Plymouth Laira MPD. Transferred to Old Oak Common MPD, London, in March 1959, and finally to Cardiff...

Jeremy Hosking
Jeremy Hosking
Jeremy J. Hosking is a British businessman, a co-founder and investment portfolio manager for private investment fund Marathon. Hosking is also well known for his extensive collection of steam locomotives, and 25% share holding in Crystal Palace F.C....

Didcot Railway Centre
Didcot Railway Centre
Didcot Railway Centre, located in the town of Didcot in the English county of Oxfordshire, is based around the site of a comprehensive "engine shed" which became redundant after the nationalisation of the UK railways, due to the gradual changeover from steam to diesel motive power.-Description:The...

Operational, main line certified

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