branch from Latimer Road to Kensington (Addison Road). An electric service with jointly owned rolling stock started on the route in November 1906. In the same year, the Met suspended running on the East London Railway, terminating instead at the District's station at Whitechapel. The Metropolitan Railway beyond Harrow was not electrified so services were hauled by an electric locomotive from Baker Street and changed for a steam locomotive en route. Integration (1902–1933) Underground Electric Railways Company of London The Charing Cross, Euston and Hampstead Railway, was authorised from Charing Cross to Hampstead and Highgate in 1893, but had not found financial backing. Yerkes bought the rights in 1900, and obtained additional approval for a branch from Camden Town to Golders Green. The Baker Street and Waterloo Railway had been authorised to run from Baker Street to Waterloo station. Work began in 1898, and extensions to Paddington station and Elephant & Castle were authorised in 1900, but came to a halt with the collapse of their financial backers in 1901. Yerkes bought the rights to this railway in 1902. The District had permission for a deep-level tube from Earl's Court to Mansion House and in 1898 had bought the Brompton and Piccadilly Circus Railway that had authority for a tube from South Kensington to Piccadilly Circus. The District's plans were combined by Yerkes with those of the Great Northern and Strand Railway, a tube railway with permission to build a line from Strand to Finsbury Park, to create the Great Northern, Piccadilly and Brompton Railway. In April 1902, the Underground Electric Railways Company of London (UERL) was established, with Yerkes as chairman, to control these companies and manage the planned works. On 8 June 1902, the UERL took over the Metropolitan District Traction Company. The UERL built a large power station that would be capable of providing power for the District and underground lines under construction. Work began in 1902 at Lots Road, by Chelsea Creek, and in February 1905 Lots Road Power Station began generating electricity. For the three lines similar electric multiple units were purchased, known as "Gate Stock" as access to the cars was via lattice gates at each end operated by gatemen. As on the District Railway the track was provided with separate positive and negative conductor rails, in what was to become a London Underground standard. A number of the surface buildings, with an exterior