Please answer the following question: Information: - British Railways (BR), 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 between 1994 and 1997. Originally a trading brand of the Railway Executive of the British Transport Commission, it became an independent statutory corporation in 1962: the British Railways Board. - 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 . - The Railways Act 1921 (c. 55), also known as the Grouping Act, was an Act of Parliament enacted 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 the country had derived from a Government-controlled railway during and after the Great War of 1914-1918. The provisions of the Act took effect from the start of 1923. - The railway system in Great Britain is the oldest in the world: the world's first locomotive-hauled public railway opened in 1825. Most of the railway track is managed by Network Rail, which in 2015 had a network of of standard-gauge lines, of which were electrified. These lines range from single to quadruple track or more. In addition, some cities have separate rail-based mass transit systems (including the extensive and historic London Underground). There are also several private railways (some of them narrow-gauge), which are primarily short tourist lines. The British railway network is connected with that of continental Europe by an undersea rail link, the Channel Tunnel, opened in 1994. - The privatisation of British Rail (BR) was the process by which ownership and operation of the railways of Great Britain passed from government control into private hands. Begun in 1994, it had been completed by 1997. - The British Railways Board (BRB) was a nationalised industry in the United Kingdom that operated from 1963 to 2001. Until 1997 it was responsible for most railway services in Great Britain, trading under the brand name British Railways and, from 1965, British Rail. It did not operate railways in Northern Ireland, where railways were the responsibility of the Government of Northern Ireland. - The British Transport Commission (BTC) was created by Clement Attlee's post-war Labour government as a part of its nationalisation programme, to oversee railways, canals and road freight transport in Great Britain (Northern Ireland had the separate Ulster Transport Authority). Its general duty under the Transport Act 1947 was to provide "an efficient, adequate, economical and properly integrated system of public inland transport and port facilities within Great Britain for passengers and goods", excluding transport by air. - The Great Western Railway (GWR) was a British railway company that linked London with The Midlands, the south-west and west of England and most of Wales. It was founded in 1833, received its enabling Act of Parliament on 31 August 1835 and ran its first trains in 1838. It was engineered by Isambard Kingdom Brunel, who chose a broad gauge of -- later slightly widened to -- but, from 1854, a series of amalgamations saw it also operate standard-gauge trains; the last broad-gauge services were operated in 1892. The GWR was the only company to keep its identity through the Railways Act 1921, which amalgamated it with the remaining independent railways within its territory, and it was finally merged at the end of 1947 when it was nationalised and became the Western Region of British Railways. - Wales is a country that is part of the United Kingdom and the island of Great Britain. It is bordered by England to the east, the Irish Sea to the north and west, and the Bristol Channel to the south. It had a population in 2011 of 3,063,456 and has a total area of . Wales has over of coastline and is largely mountainous, with its higher peaks in the north and central areas, including Snowdon, its highest summit. The country lies within the north temperate zone and has a changeable, maritime climate. - The Western Region was a region of British Railways from 1948. The region ceased to be an operating unit in its own right on completion of the 'Organising for Quality' initiative on 6th April 1992. The Region consisted principally of ex-Great Western Railway lines, minus certain lines west of Birmingham, which were transferred to the London Midland Region in 1963 and with the addition of all former Southern Railway routes west of Exeter, which were subsequently rationalised. Given the information above, choose from the list below the object entity that exhibits the relation 'service retirement' with the subject 'gwr railcars'. Choices: - 1838 - 1921 - 1947 - 1948 - 1962 - 1963 - 1965 - 1992 - 1994 - 2001 - 2011
Answer:
1962