London and into the Home Counties with a branch to Heathrow Airport. It is Europe's biggest construction project, with a £15 billion projected cost. London is the centre of the National Rail network, with 70 per cent of rail journeys starting or ending in London. Like suburban rail services, regional and inter-city trains depart from several termini around the city centre, linking London with the rest of Britain including Birmingham, Brighton, Reading, Bristol, Cardiff, Derby, Exeter, Sheffield, Southampton, Leeds, Liverpool, Manchester, Cambridge, Newcastle upon Tyne, Edinburgh and Glasgow. Some international railway services to Continental Europe were operated during the 20th century
London Stansted Airport concrete track. The system uses a mix of Adtranz C-100 and Bombardier Innovia APM 100 vehicles to carry passengers to departure gates. Unlike the similar Gatwick Airport transit, the Stansted transit is only accessible "airside" (i.e. only after passengers pass through security). Stansted Airport railway station is situated in the terminal building directly below the main concourse. Services to London are on the Stansted Express train to and from London Liverpool Street in Central London. This service operates every 15 minutes and the usual journey time is roughly 45 to 53 minutes. Liverpool Street is served by the Central, Circle,