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One of the two eastern sections runs underground from Whitechapel to Stratford, then on the surface on the existing main line.
The service will replace the "Shenfield metro", with key stops at Ilford, Romford (for interchange with London Overground services to Upminster), Gidea Park (where some peak hour trains will start or terminate), and Shenfield.
A "dive-under" was constructed at Acton to allow passenger trains to pass slower freight trains leaving and entering a goods yard.
It was completed in July 2016 and was brought into use in 2017.
Crossrail is a 118-kilometre (73-mile) railway line under development in England, running through parts of London and the home counties of Berkshire, Buckinghamshire and Essex.
The central section and a large portion of the line, between Paddington in central London and Abbey Wood in the south-east, are due to open in December 2018, when it will be named the Elizabeth line in honour of Queen Elizabeth II.
The tunnelled sections will be approximately 22 kilometres (14 mi) in length.The central tunnels run from a portal just west of Paddington to Whitechapel, with further tunnelling to Stratford and to Canary Wharf.There will be new stations at Paddington, Bond Street, Tottenham Court Road, Farringdon, Liverpool Street and Whitechapel, with interchanges with the London Underground and other National Rail services.The need for extra capacity along this corridor is such that the former head of Tf L, Sir Peter Hendy, predicted that the Crossrail lines will be "immediately full" as soon as they open.The concept of large-diameter tunnels crossing central London to connect Paddington in the west and Liverpool Street in the east was first proposed by railwayman George Dow in The Star newspaper in June 1941.
One branch runs to Heathrow Central (for Terminals 2 and 3), Heathrow Terminal 4 and Heathrow Terminal 5, The main western section runs on the surface from Reading to Acton Main Line.