page_title: Timeline of the London Underground
section_title: 1920s
hierarchical_section_title: Timeline of the London Underground / 1920s
context_page_description: The transport system now known as the London Underground began in 1863 with the Metropolitan Railway, the world's first underground railway. Over the next forty years, the early sub-surface lines reached out from the urban centre of the capital into the surrounding rural margins, leading to the development of new commuter suburbs. At the turn of the nineteenth century, new technology—including electric locomotives and improvements to the tunnelling shield—enabled new companies to construct a series of "tube" lines deeper underground. Initially rivals, the tube railway companies began to co-operate in advertising and through shared branding, eventually consolidating under the single ownership of the Underground Electric Railways Company of London, with lines stretching across London.
  In 1933, the UK Government amalgamated the UERL and the Metropolitan Railway as a single organisation, named the London Passenger Transport Board.
context_section_description: 1920
  CLR extends from Wood Lane to Ealing Broadway.
  1922
  Underground Group purchases unbuilt Watford and Edgware Railway to extend the Hampstead tube to Watford.
  1923
  Hampstead tube extends to Hendon Central.
  1924
  Hampstead tube extends to Edgware.
  C&SLR extends from Euston to connect to Hampstead tube at Camden Town.
  1925
  MR extends from Moor Park to Watford.
  1926
  Hampstead tube links Embankment to Kennington and C&SLR extends to Morden, completing the integration of the two lines.
  1929
  55 Broadway opens as headquarters of the Underground Group.
caption: 55 Broadway, built between 1927 and 1929
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