found: Wikipedia WWW site, 7 Aug. 2008(the Underground Electric Railways Company of London Limited (UERL) was the holding company for three of the new deep-level "tube" underground railway lines constructed in London; the London Electric Railway Company (LER) was est. 1910 by the London Electric Railway Amalgamation Act from a merger of the Charing Cross, Euston & Hampstead Railway (CCE&HR) now part of the Northern Line; Baker Street & Waterloo Railway (BS&WR), now part of the Bakerloo Line; Great Northern, Piccadilly & Brompton Railway (GNP&BR), now part of the Piccadilly Line; on 1 Jan. 1913, it bought the City and South London Railway and the Central London Railway; in 1933, merged into the London Passenger Transport Board)