History of rail transport in Great Britain 1923 - 1947
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History of rail transport in Great Britain
The railway system of Great Britain, the principal territory of the United Kingdom, is the oldest in the world. The system was originally built as a patchwork of local rail links operated by small private railway companies. These isolated links developed during the railway boom of the 1840s into a...



The history of rail transport in Great Britain 1923–1947 covers the period when the British railway system was run by the Big Four
Big Four British railway companies
The Big Four was a name used to describe the four largest railway companies in the United Kingdom in the period 1923-1947. The name was coined by the Railway Magazine in its issue of February 1923: "The Big Four of the New Railway Era".The Big Four were:...

 group of companies – the London, Midland and Scottish Railway
London, Midland and Scottish Railway
The London Midland and Scottish Railway was a British railway company. It was formed on 1 January 1923 under the Railways Act of 1921, which required the grouping of over 120 separate railway companies into just four...

 (LMS); 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...

 (GWR); the London and North Eastern Railway
London and North Eastern Railway
The London and North Eastern Railway was the second-largest of the "Big Four" railway companies created by the Railways Act 1921 in Britain...

 (LNER); and the Southern Railway (SR). The period includes the investment following World War I; the rise in competition from the roads in the 1920s; development of steam locomotives capable of sustained 100 mph (160 km/h) running; the Great Depression
Great Depression
The Great Depression was a severe worldwide economic depression in the decade preceding World War II. The timing of the Great Depression varied across nations, but in most countries it started in about 1929 and lasted until the late 1930s or early 1940s...

 of the 1930s; World War II and its aftermath; and the lead up to nationalisation during 1947.

Background

During the First World War the railway network was taken under government control and run by the Railway Operating Division of the War Office
War Office
The War Office was a department of the British Government, responsible for the administration of the British Army between the 17th century and 1964, when its functions were transferred to the Ministry of Defence...

. This revealed some advantages in running the railways with fewer companies, and after the war it was widely agreed that the required development of the rail network could not be achieved under the conditions that had existed before the war. The nationalisation of the railways, which had been mooted by William Ewart Gladstone
William Ewart Gladstone
William Ewart Gladstone FRS FSS was a British Liberal statesman. In a career lasting over sixty years, he served as Prime Minister four separate times , more than any other person. Gladstone was also Britain's oldest Prime Minister, 84 years old when he resigned for the last time...

 as early as the 1830s, was considered, but was rejected by the government and the owners of the rail companies. A compromise was created in the Railways Act 1921
Railways Act 1921
The Railways Act 1921, also known as the Grouping Act, was an enactment by the British government of David Lloyd George intended to stem the losses being made by many of the country's 120 railway companies, move the railways away from internal competition, and to retain some of the benefits which...

. Under this act, almost all of the hundreds of existing rail companies were grouped together into four new companies:
  • London, Midland and Scottish Railway
    London, Midland and Scottish Railway
    The London Midland and Scottish Railway was a British railway company. It was formed on 1 January 1923 under the Railways Act of 1921, which required the grouping of over 120 separate railway companies into just four...

     (LMS)
  • 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...

     (GWR)
  • London and North Eastern Railway
    London and North Eastern Railway
    The London and North Eastern Railway was the second-largest of the "Big Four" railway companies created by the Railways Act 1921 in Britain...

     (LNER)
  • Southern Railway (SR)


This "grouping" had first been proposed in the 1850s, and lasted from 1 January 1923 to 31 December 1947. (See also List of railway companies involved in the 1923 grouping). Some lines remained outside this grouping, particularly those operated as Joint railway
Joint railway
A joint railway is a railway operating under the control of more than one railway company: those companies very often supplying the traction over the railway.-United Kingdom:There are many examples of joint railway working in the United Kingdom...

s – such as the Midland and Great Northern Joint Railway
Midland and Great Northern Joint Railway
The Midland and Great Northern Joint Railway, was a joint railway owned by the Midland Railway and the Great Northern Railway in eastern England, affectionately known as the 'Muddle and Get Nowhere' to generations of passengers, enthusiasts, and other users.The main line ran from Peterborough to...

 and the Somerset and Dorset Joint Railway
Somerset and Dorset Joint Railway
The Somerset & Dorset Joint Railway – almost always referred to as "the S&D" – was an English railway line connecting Bath in north east Somerset and Bournemouth now in south east Dorset but then in Hampshire...

. The four companies were and are referred to as "The Big Four"

Although not in direct competition with each other over most of their routes, the Big Four competed to be the fastest, most modern and most comfortable, spurred on by increasing competition from road transport. Products of this competition were the LMS and LNER races to Scotland, with the famous Flying Scotsman
Flying Scotsman (train)
The Flying Scotsman is an express passenger train service that has been running between London and Edinburgh—the capitals of England and Scotland respectively—since 1862...

 service and LNER's Mallard
LNER Class A4 4468 Mallard
Number 4468 Mallard is a London and North Eastern Railway Class A4 4-6-2 Pacific steam locomotive built at Doncaster, England in 1938. While in other respects a relatively typical member of its class, it is historically significant for being the holder of the official world speed record for steam...

setting a world speed record of 126 mph, the LMS's production of diesel railcars, electrification of lines by the LNER, the GWR's ingenious marketing and the SR's mass electrification scheme, which led to nearly the whole of the south east's trains being electric. Many claimed Britain had the best railways in the world at this period, and it could certainly be justified.

Competition from the roads

Road transport grew rapidly during the 1920s, stimulated by the cheap sale of thousands of war-surplus vans and lorries and the subsidised construction of new roads, which was mainly funded by local authorities. The revenues of the railway companies suffered because of the loss of freight to road haulage in particular. This was largely because the Government would not release the railways from their obligations as 'common carriers', which had been brought in the 19th century. It obliged railway companies to carry any cargo offered to it at a nationally agreed charge, which was usually well below a rate necessary to make the operation profitable for the railways. The intention had been to stop railway companies "cherry picking" the most profitable freight whilst refusing to carry less profitable freight. This had been a necessary measure when railways had had an effective monopoly over land transport. But with road competition encroaching, it put the railways at a disadvantage, because they had to subsidise unprofitable freight operations with profitable ones, which drove up charges.

The road haulage operators, who had no such restrictions, could privately negotiate any rate they wished to undercut the railways' published price lists, and take away their business while offering door-to-door delivery. The train companies had previously relied on horse-drawn trailers for local goods deliveries from the station; to compete they bought in motorised local delivery vehicles such as the Karrier
Karrier
Karrier is a marque of car and commercial vehicle, the origins of which can be traced back to Clayton and Company, a 1904 company from Huddersfield, West Yorkshire, UK. In 1908, they started making Karrier cars and in 1920 changed the company name to Karrier Motors Ltd.In 1929, Karrier started...

 'Cob' and Scammell 'Mechanical Horse'. It was then thought that no large railway could operate at a profit unless more than half of its traffic was freight, and thus any reduction in the freight business would also affect the viability of the passenger business.

A Royal Commission on Road and Rail Transport in 1931 was ineffectual at producing a solution. However, the subsequent Salter Report
Salter Report
The Salter Report was named after Arthur Salter, who chaired an influential conference of road and rail experts in 1932. The report directed British government policy for transport funding for decades to follow.- Railways :...

 of 1933 was adopted as government policy; the Ministry of Transport
Department for Transport
In the United Kingdom, the Department for Transport is the government department responsible for the English transport network and a limited number of transport matters in Scotland, Wales and Northern Ireland which are not devolved...

 lifted some of the restrictions on the railways while introducing licensing and safety regulations on hauliers. Against a storm of protest, the Chancellor of the Exchequer
Chancellor of the Exchequer
The Chancellor of the Exchequer is the title held by the British Cabinet minister who is responsible for all economic and financial matters. Often simply called the Chancellor, the office-holder controls HM Treasury and plays a role akin to the posts of Minister of Finance or Secretary of the...

, Neville Chamberlain
Neville Chamberlain
Arthur Neville Chamberlain FRS was a British Conservative politician who served as Prime Minister of the United Kingdom from May 1937 to May 1940. Chamberlain is best known for his appeasement foreign policy, and in particular for his signing of the Munich Agreement in 1938, conceding the...

, significantly increased vehicle excise duty
Vehicle excise duty
Vehicle Excise Duty is a vehicle road use tax levied as an excise duty which must be paid for most types of vehicle which are to be used on the public roads in the United Kingdom...

 so that all motor vehicles would pay the whole cost of the annual Road Fund.

However just as the campaign looked like being successful, World War II started. The common carrier requirement was not lifted until 1957.

Changes and developments

With the transport policy pursued by the government, and more general changes in lifestyle favouring travel by road, the Big Four railways never ran a healthy profit. Indeed, the LNER never made a profit at all. However, they were still able to produce the world-leading services on the East Coast Main Line, running trains at speeds of up to 110 mph, a remarkable achievement. Also the SR invested heavily in electrification of all its lines, and this electrification was done at a far faster rate than at any time under BR.

In the 16 years before the outbreak of World War II, the new companies set about the tremendous task of rebuilding railways which had had little or no work done since the end of World War I hostilities in 1918. Priority was new rolling stock: locomotives, coaches and wagons. As an example of the need for rationalisation, the LMSR took over 10,316 steam locomotives at the grouping: these comprised no fewer than 393 different classes.

In the 1920s, the companies produced some exceptional locomotives:
  • LMSR: Royal Scot class 4-6-0 (1927); Sir Henry Fowler
    Henry Fowler (engineer)
    Sir Henry Fowler, KBE was a Chief Mechanical Engineer of the Midland Railway and subsequently the London, Midland and Scottish Railway.- Biography :...

     was Chief Mechanical Engineer (CME)
  • LNER: A4 Pacific 4-6-2 (1935) (world steam speed record holder); A3 Pacific class 4-6-2 (1927); B17 Sandringham class 4-6-0 (1928); Sir Nigel Gresley
    Nigel Gresley
    Sir Herbert Nigel Gresley was one of Britain's most famous steam locomotive engineers, who rose to become Chief Mechanical Engineer of the London and North Eastern Railway . He was the designer of some of the most famous steam locomotives in Britain, including the LNER Class A1 and LNER Class A4...

     CME
  • GWR: Castle class 4-6-0 (1923); King class 4-6-0 (1927); Hallclass 4-6-0 (1928): Charles B. Collett CME
  • SR: King Arthur class 4-6-0 (1925); Lord Nelson class 4-6-0 (1926); R.E.L. Maunsell CME

In addition to those mainly passenger locomotives, many new classes of freight engines were produced: the pannier tank
Tank locomotive
A tank locomotive or tank engine is a steam locomotive that carries its water in one or more on-board water tanks, instead of pulling it behind it in a tender. It will most likely also have some kind of bunker to hold the fuel. There are several different types of tank locomotive dependent upon...

 locomotives of the GWR and the Garratt heavy freight 2-6-0+0-6-2 locomotive of the LMS (although the latter were not a huge success and only a few were built) being two examples.

Total length of the British railways at 1 January 1923 was 19,585 route miles (31,336 km). From the end of the 1920s, when it was obvious that the motor vehicle was in the ascendancy, dozens of little-used branch lines began to close: some to passenger traffic, many completely.

Although few railways were constructed, some new works were undertaken. Among them were:
  • Station redevelopments (notably those at Manchester and Paddington)
  • Lines to allow easier running – one example being those on the Isle of Thanet
    Isle of Thanet
    The Isle of Thanet lies at the most easterly point of Kent, England. While in the past it was separated from the mainland by the nearly -wide River Wantsum, it is no longer an island ....

  • The Southern Railway began a programme of main-line electrification
    Railway electrification in Great Britain
    Railway electrification in Great Britain started towards of the 19th century. A great range of voltages have been used in the intervening period using both overhead lines and third rails, however the most common standard for mainline services is now 25 kV AC using overhead lines and the...

    , which was to bring fast services to many of the south coast resorts, and to extend the London suburban routes.

World War II and its aftermath

During World War II the railway companies' managements joined together, effectively becoming one company. The railways were used more heavily than at any time in their history during this period.

The railway system suffered heavy damage in some areas due to German Luftwaffe
Luftwaffe
Luftwaffe is a generic German term for an air force. It is also the official name for two of the four historic German air forces, the Wehrmacht air arm founded in 1935 and disbanded in 1946; and the current Bundeswehr air arm founded in 1956....

 bombing, especially in cities such as London and Coventry
Coventry
Coventry is a city and metropolitan borough in the county of West Midlands in England. Coventry is the 9th largest city in England and the 11th largest in the United Kingdom. It is also the second largest city in the English Midlands, after Birmingham, with a population of 300,848, although...

. However this damage was not as extensive as it was in many other European countries such as France and Germany. This unwittingly worked to the railways' disadvantage, because in other European countries the damage to their railway systems had been so bad that it gave them an opportunity to essentially re-build their railway systems from scratch, and dramatically modernise them.

During the war very little was invested in the railways and they became increasingly run-down. With only essential maintenance work being carried out during the war, the maintenance backlog increased even further. Rolling stock
Rolling stock
Rolling stock comprises all the vehicles that move on a railway. It usually includes both powered and unpowered vehicles, for example locomotives, railroad cars, coaches and wagons...

 also began to deteriorate. After the war, it was clear that the rail network could not be maintained in the private sector. According to a calculation by the Central Statistical Office during the period 1938–1953 the railways suffered a net disinvestment
Disinvestment
Disinvestment, sometimes referred to as divestment, refers to the use of a concerted economic boycott, with specific emphasis on liquidating stock, to pressure a government, industry, or company towards a change in policy, or in the case of governments, even regime change...

 of £440 million (around £11 billion in 2005 prices)

London, Midland and Scottish Railway

The LMS
London, Midland and Scottish Railway
The London Midland and Scottish Railway was a British railway company. It was formed on 1 January 1923 under the Railways Act of 1921, which required the grouping of over 120 separate railway companies into just four...

 claimed to be the world's largest joint stock organisation, the largest transport organisation, and the largest commercial undertaking in Europe (although they did not say on what basis), including the largest chain of hotel
Hotel
A hotel is an establishment that provides paid lodging on a short-term basis. The provision of basic accommodation, in times past, consisting only of a room with a bed, a cupboard, a small table and a washstand has largely been replaced by rooms with modern facilities, including en-suite bathrooms...

s. In 1938, the LMS operated 6,870 route miles (11,056 km) of railway (excluding its lines in Northern Ireland
Northern Ireland
Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west...

). However, it was not very profitable, with a rate of return of only 2.7%.

The principal LMS trunk routes
Trunk road
A trunk road, trunk highway, or strategic road is a major road—usually connecting two or more cities, ports, airports, and other things.—which is the recommended route for long-distance and freight traffic...

 were the West Coast Main Line
West Coast Main Line
The West Coast Main Line is the busiest mixed-traffic railway route in Britain, being the country's most important rail backbone in terms of population served. Fast, long-distance inter-city passenger services are provided between London, the West Midlands, the North West, North Wales and the...

 and the Midland Main Line
Midland Main Line
The Midland Main Line is a major railway route in the United Kingdom, part of the British railway system.The present-day line links London St...

, which linked London, the industrial Midlands and North-West of England, and Scotland. The railway's main business was the transport of freight between these major industrial centres, rather than passengers.

The early history of the LMS was dominated by infighting between its two largest constituents, the Midland
Midland Railway
The Midland Railway was a railway company in the United Kingdom from 1844 to 1922, when it became part of the London, Midland and Scottish Railway....

 and the North Western
London and North Western Railway
The London and North Western Railway was a British railway company between 1846 and 1922. It was created by the merger of three companies – the Grand Junction Railway, the London and Birmingham Railway and the Manchester and Birmingham Railway...

, previously two fierce rivals. Generally, the Midland way prevailed, with the adoption of many Midland practices, such as the livery
Livery
A livery is a uniform, insignia or symbol adorning, in a non-military context, a person, an object or a vehicle that denotes a relationship between the wearer of the livery and an individual or corporate body. Often, elements of the heraldry relating to the individual or corporate body feature in...

 of crimson lake for passenger locomotives and rolling stock as well as the continuation of the Midland Railway's small engine policy. The arrival of the new Chief Mechanical Engineer William Stanier
William Stanier
Sir William Arthur Stanier, FRS was Chief Mechanical Engineer of the London, Midland and Scottish Railway.- Biography :...

 heralded a change in the LMS, introducing new ideas rather than continuing with the company's internal conflict.

See also: List of constituents of the LMS.

London and North Eastern Railway

The LNER
London and North Eastern Railway
The London and North Eastern Railway was the second-largest of the "Big Four" railway companies created by the Railways Act 1921 in Britain...

, covered the arc of the country between north and east of London. This included the East Coast Main Line
East Coast Main Line
The East Coast Main Line is a long electrified high-speed railway link between London, Peterborough, Doncaster, Wakefield, Leeds, York, Darlington, Newcastle and Edinburgh...

 from London to Edinburgh
Edinburgh
Edinburgh is the capital city of Scotland, the second largest city in Scotland, and the eighth most populous in the United Kingdom. The City of Edinburgh Council governs one of Scotland's 32 local government council areas. The council area includes urban Edinburgh and a rural area...

 via York
York
York is a walled city, situated at the confluence of the Rivers Ouse and Foss in North Yorkshire, England. The city has a rich heritage and has provided the backdrop to major political events throughout much of its two millennia of existence...

 and Newcastle upon Tyne
Newcastle upon Tyne
Newcastle upon Tyne is a city and metropolitan borough of Tyne and Wear, in North East England. Historically a part of Northumberland, it is situated on the north bank of the River Tyne...

, as well as the routes from Edinburgh to Aberdeen and Inverness
Inverness
Inverness is a city in the Scottish Highlands. It is the administrative centre for the Highland council area, and is regarded as the capital of the Highlands of Scotland...

. It also included most of the country east of the Pennines
Pennines
The Pennines are a low-rising mountain range, separating the North West of England from Yorkshire and the North East.Often described as the "backbone of England", they form a more-or-less continuous range stretching from the Peak District in Derbyshire, around the northern and eastern edges of...

, plus East Anglia
East Anglia
East Anglia is a traditional name for a region of eastern England, named after an ancient Anglo-Saxon kingdom, the Kingdom of the East Angles. The Angles took their name from their homeland Angeln, in northern Germany. East Anglia initially consisted of Norfolk and Suffolk, but upon the marriage of...

. The total route mileage was 6590 miles (10,605 km). The LNER's main workshops were in Doncaster
Doncaster
Doncaster is a town in South Yorkshire, England, and the principal settlement of the Metropolitan Borough of Doncaster. The town is about from Sheffield and is popularly referred to as "Donny"...

.

The LNER hauled more than one-third of Britain's coal, and derived two thirds of its income from freight services. Despite this, the main image that the LNER presented of itself was one of glamour, of fast trains and sophisticated destinations. The LNER's advertising campaign was highly sophisticated and advanced compared to those of its rivals. Top graphic designers and poster artists such as Tom Purvis
Tom Purvis
Tom Purvis was a British painter and commercial poster artist.-Early life:Purvis was born in Bristol, the son of sailor and marine artist TG Purvis. He studied at Camberwell School of Art and worked for six years at the advertising firm of Mather and Crowther before becoming a freelance designer...

 were employed to promote its services and encourage the public to visit the holiday destinations of the east coast during the summer.

The first chief mechanical engineer of the LNER was Sir Nigel Gresley, who held the post for most of the LNER's life. He was noted for his "Big Engine" policy, and is best remembered for his large express passenger locomotives, many times the holder of the world speed record for steam locomotives. LNER Class A4
LNER Class A4
The Class A4 is a class of streamlined 4-6-2 steam locomotive, designed by Nigel Gresley for the London and North Eastern Railway in 1935. Their streamlined design gave them high-speed capability as well as making them instantly recognizable, and one of the class, 4468 Mallard, still claims the...

 4-6-2
Whyte notation
The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early twentieth century encouraged by an editorial in American Engineer and Railroad Journal...

 Pacific
4-6-2
4-6-2, in the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles , six powered and coupled driving wheels on three axles, and two trailing wheels on one axle .These locomotives are also known as Pacifics...

 locomotive Mallard still holds the land speed record for a steam locomotive. Gresley died in office in 1941.

See also: List of constituents of the London and North Eastern Railway

Great Western Railway

The GWR
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...

 was the only one of the big four to take its name from a predecessor. Its total route length was 3800 miles (6116 km), much of which had been built to handle the coal traffic from south Wales. Though this appeared to be a great coup for the GWR, the coal traffic declined significantly as the use of coal as a naval fuel declined, and within a decade the GWR was itself the largest single user of Welsh coal. The 1920s also saw the introduction of the GWR's most famous locomotives – the Castle
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...

 and King
GWR 6000 Class
The Great Western Railway 6000 Class or King is a class of 4-6-0 steam locomotive designed for express passenger work. With the exception of one Pacific , they were the largest locomotives the GWR built. They were named after kings of the United Kingdom and of England, beginning with the reigning...

 classes developed by 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:...

. The 1930s brought hard times, and the records set by the Castles and Kings were surpassed by other companies, but the company remained in relatively good financial health despite the Depression
Great Depression
The Great Depression was a severe worldwide economic depression in the decade preceding World War II. The timing of the Great Depression varied across nations, but in most countries it started in about 1929 and lasted until the late 1930s or early 1940s...

.

In 1933, the Great Western Railway introduced the first of what was to become a successful series of railcars
GWR railcars
In 1933, the Great Western Railway introduced the first of what was to become a very successful series of railcars, which survived in regular use into the 1960s, when they were replaced with the new British Rail "first generation" type diesel multiple units....

, which survived in regular use until they were replaced by British Rail
British Rail
British Railways , which from 1965 traded as British Rail, was the operator of most of the rail transport in Great Britain between 1948 and 1997. It was formed from the nationalisation of the "Big Four" British railway companies and lasted until the gradual privatisation of British Rail, in stages...

ways in the 1960s. The original design featured 'air-smoothed' bodywork, which was very much the fashion at the time. The rounded lines of the first examples built lead to their nickname of "flying banana". Later examples had much more angular (and practical) bodywork, yet the nickname persisted for these too.

See also: List of constituents of the Great Western Railway

Southern Railway

The Southern Railway
Southern Railway (Great Britain)
The Southern Railway was a British railway company established in the 1923 Grouping. It linked London with the Channel ports, South West England, South coast resorts and Kent...

 was geographically the smallest of the Big Four, and had 2,186 route miles (3518 km). Confined to the south of England, it owned no track north of London. Unlike the rest of the Big Four, the Southern Railway was predominantly a passenger railway. Despite its small size it carried more than a quarter of the UK's total passenger traffic. This is because the area covered by the railway included many of the dense commuter lines around London, as well as serving some of the most densely populated parts of the country.

The Southern Railway was particularly successful at promoting itself to the public. "Sunny South Sam" became a character fixed firmly in the public mind as embodying the service of the railway, whilst slogans such as "live in Kent
Kent
Kent is a county in southeast England, and is one of the home counties. It borders East Sussex, Surrey and Greater London and has a defined boundary with Essex in the middle of the Thames Estuary. The ceremonial county boundaries of Kent include the shire county of Kent and the unitary borough of...

 and be content" encouraged commuters to move out from London, and thus further patronise the services offered by the railway.

The Southern Railway had a strong commitment to electrification
Railway electrification in Great Britain
Railway electrification in Great Britain started towards of the 19th century. A great range of voltages have been used in the intervening period using both overhead lines and third rails, however the most common standard for mainline services is now 25 kV AC using overhead lines and the...

. The intensively used commuter system in a relatively small geographical area made the Southern a natural candidate for electrification. After the Grouping, the LSWR
London and South Western Railway
The London and South Western Railway was a railway company in England from 1838 to 1922. Its network extended from London to Plymouth via Salisbury and Exeter, with branches to Ilfracombe and Padstow and via Southampton to Bournemouth and Weymouth. It also had many routes connecting towns in...

's 660V
Volt
The volt is the SI derived unit for electric potential, electric potential difference, and electromotive force. The volt is named in honor of the Italian physicist Alessandro Volta , who invented the voltaic pile, possibly the first chemical battery.- Definition :A single volt is defined as the...

 DC
Direct current
Direct current is the unidirectional flow of electric charge. Direct current is produced by such sources as batteries, thermocouples, solar cells, and commutator-type electric machines of the dynamo type. Direct current may flow in a conductor such as a wire, but can also flow through...

 third rail system was adopted for the whole region. LSWR metro area was initially electrified, soon followed by conversion LBSCR's
London, Brighton and South Coast Railway
The London, Brighton and South Coast Railway was a railway company in the United Kingdom from 1846 to 1922. Its territory formed a rough triangle, with London at its apex, practically the whole coastline of Sussex as its base, and a large part of Surrey...

 6.6kV AC Overhead electrified London Metro lines and then the SECR's
South Eastern and Chatham Railway
The South Eastern and Chatham Railway Companies Joint Management Committee , known by its shorter name of the South Eastern and Chatham Railway was a working union of two neighbouring rival railways, the South Eastern Railway and London, Chatham and Dover Railway , that operated services between...

 metro lines around London in the 1920s. The 1930s saw mainline electrification of the Brighton Main Line
Brighton Main Line
The Brighton Main Line is a British railway line from London Victoria and London Bridge to Brighton. It is about 50 miles long, and is electrified throughout. Trains are operated by Southern, First Capital Connect, and Gatwick Express, now part of Southern.-Original proposals:There were no fewer...

 and the Portsmouth Direct Line
Portsmouth Direct Line
The Portsmouth Direct Line is the route of a railway service operated by South West Trains which runs between London Waterloo and Portsmouth Harbour, England...

 with associated several surround lines (such as the East
East Coastway Line
East Coastway is the name used by the train operating company, Southern , for the routes it operates along the south coast of Sussex and Kent to the east of Brighton, England. Those to the West of Brighton are named the West Coastway Line...

 and West
West Coastway Line
The West Coastway Line is a railway line in England, along the south coast of West Sussex and Hampshire, between Brighton and Southampton, plus the short branches to Littlehampton and Bognor Regis....

 Coastways). Outer suburban electrification was also extensive (e.g. to Gillingham
Gillingham (Kent) railway station
Gillingham railway station in the town of Gillingham , north Kent, is on the Chatham Main Line between and Rainham stations. Train services are provided by Southeastern....

, Maidstone, etc.). Proposal existed for further to the Kent Coast but the war
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 halted these plans. Originally, only electric multiple unit
Electric multiple unit
An electric multiple unit or EMU is a multiple unit train consisting of self-propelled carriages, using electricity as the motive power. An EMU requires no separate locomotive, as electric traction motors are incorporated within one or a number of the carriages...

 trains were used, but later electric locomotive
Electric locomotive
An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or an on-board energy storage device...

s and electro-diesel hybrids were developed.

During World War II, the Southern found itself at the front line. Before hostilities, 75% of SR traffic was passenger with just 25% being freight. During the war, roughly the same number of passengers was carried, but only made up 40% of total traffic – freight traffic had increased 4.5-fold. A shortage of freight locomotives was remedied by Chief Engineer Oliver Bulleid
Oliver Bulleid
Oliver Vaughan Snell Bulleid was a British railway and mechanical engineer best known as the Chief Mechanical Engineer of the Southern Railway between 1937 and the 1948 nationalisation, developing many well-known locomotives.- Early life and Great Northern Railway :He was born in Invercargill,...

, who designed a 0-6-0
Whyte notation
The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early twentieth century encouraged by an editorial in American Engineer and Railroad Journal...

 locomotive, the SR Class Q1
SR Class Q1
The SR Q1 class is a type of austerity steam locomotive constructed during the Second World War. The class was designed by Oliver Bulleid for use on the intensive freight turns experienced during wartime on the Southern Railway network. A total of 40 locomotives were built. Bulleid...

. This was the largest 0-6-0 to operate in Britain, and forty of these transformed the Southern's ability to haul heavy freight.

See also: List of constituent companies of the Southern Railway
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