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.

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In the east, the line splits at Whitechapel, with one branch running over the existing Great Eastern Main Line via Stratford to Shenfield, and the other branch running through Canary Wharf and emerging from the tunnel at Custom House on a disused part of the North London Line, continuing under the River Thames to Abbey Wood.

In the west the route connects with the Great Western Main Line at Paddington and runs to Hayes and Harlington, where it splits.

Part of the eastern section, between Liverpool Street and Shenfield in Essex, was transferred to a precursor service called Tf L Rail in 2015; this section will be connected to the core route through central London to Paddington from May 2019.

The western section, from Paddington to Heathrow Airport and Reading in Berkshire, is due to open in December 2019, completing the new east–west route across London and providing a new high-frequency commuter and suburban passenger service.

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.

Upgrades are being made to stations at Maidenhead, Taplow, Burnham, Slough, Langley, Iver, West Drayton, Hayes & Harlington, Southall, Hanwell, West Ealing, Ealing Broadway and Acton Main Line.

Although the idea was seen as imaginative, only a brief estimate of cost was given: £300 million.

A feasibility study was recommended as a high priority so that the practicability and costs of the scheme could be determined.

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.

The cost of the east–west scheme including rolling stock was estimated at £885 million. A more ambitious proposal named "Superlink" was proposed in 2004, at an estimated cost of £13 billion, including additional infrastructure work outside London: in addition to Crossrail's east– west tunnel, lines would connect towns including Cambridge, Ipswich, Southend-on-Sea, Pitsea, Reading, Basingstoke and Northampton.