The LER was formed and owned by the
Underground Electric Railways Company of London (UERL) in 1910 to combine the management of three of the company's subsidiary deep-level tube railway companies: the
Baker Street and Waterloo Railway (BS&WR), the
Charing Cross, Euston and Hampstead Railway (CCE&HR) and the
Great Northern, Piccadilly and Brompton Railway (GNP&BR) which had opened in 1906 and 1907. The merger was carried out in accordance with the '''''' (
10 Edw. 7. & 1 Geo. 5. c. xxxii) by transferring the assets of the CCE&HR and the BS&WR to the GNP&BR and renaming the GNP&BR as the London Electric Railway. Although the LER management was combined, the three lines continued to be identified separately for operational purposes as the
Bakerloo tube,
Hampstead tube and
Piccadilly tube. In 1912, in preparation for the extension of the Hampstead Tube from
Golders Green to
Edgware, the LER took over the
Edgware & Hampstead Railway. When the UERL and other transport operators in the London area were merged to form the
London Passenger Transport Board on 1 July 1933, the LER was
liquidated. The LER's routes now form the central sections of the
Bakerloo line,
Northern line and
Piccadilly line. ==References==