Central line (London Underground) Hammersmith (Grove Road) railway station. Authorisation was granted in 1920, but the connection was never built, and the L&SWR tracks were used by the Piccadilly line when it was extended west of Hammersmith in 1932. On 1 July 1933, the Central London Railway and other transport companies in the London area were amalgamated to form the London Passenger Transport Board, generally known as London Transport. The railway was known as the "Central London Line", becoming the "Central line" in 1937. The 1935–40 New Works Programme included a major expansion of the line. To the west new tracks were to be
History of the London Underground Farringdon to King's Cross in 1852 . Although the plan was supported by the City of London, the railway companies were not interested and the company struggled to proceed. In 1854 the Metropolitan Railway (also known as the Met) was granted permission to build an underground line at an estimated cost of £1 million. With the Crimean War under way, the Met found it hard to raise the capital, and construction did not start until March 1860. The railway was mostly built using the "cut-and-cover" method from Paddington to King's Cross; east of King's Cross it was built by tunnelling