to Denham was due to open between January 1940 and March 1941. The eastern extension from Liverpool Street to Stratford, Leyton and Newbury Park and the connection to the LNER lines to Hainault, Epping and Ongar were intended to open in 1940 and 1941. World War II caused works on both extensions to be halted and London Underground services were extended in stages from 1946 to 1949, although the final section from West Ruislip to Denham was cancelled. Following the LPTB takeover, the Harry Beck-designed tube map began to show the route's name as the "Central London Line" instead of "Central London Railway". In anticipation of the extensions taking its services far beyond the boundaries of the County of London, "London" was omitted from the name on 1937; thereafter it was simply the "Central line". The CLR's original tunnels form the core of the Central line's route. During World War II, of completed tube tunnels built for the eastern extension between Gants Hill and Redbridge were used as a factory by Plessey to manufacture electronic parts for aircraft. Other completed tunnels were used as air-raid shelters at Liverpool Street, Bethnal Green and between Stratford and Leyton, as were the closed parts of British Museum station At Chancery Lane, new tunnels in diameter and long were constructed below the running tunnels during 1941 and early 1942. These were fitted out as a deep level shelter for government use as a protected communications centre. Work on a similar shelter was planned at Post Office station (renamed St Paul's in 1937) but was cancelled; the lift shafts that were made redundant when the station was given escalators in January 1939 were converted for use as a protected control centre for the Central Electricity Board. See also Horace Field Parshall, chairman and designer of the line's electrical distribution system Notes and references Notes References Bibliography External links Predecessor companies of the London Underground Railway companies disestablished in 1933 Railway companies established in 1889 1889 establishments in England Transport in the London Borough of Camden Transport in the City of London Transport in the London Borough of Ealing Transport in the London Borough of Hammersmith and Fulham Transport in the London Borough of Hounslow Transport in the Royal Borough of Kensington and Chelsea Transport in the London Borough of Richmond upon Thames Transport in the City of Westminster Underground Electric Railways Company of London