Crossrail is a 118-kilometre (73-mile) railway line under development in London and the home counties of Berkshire, Buckinghamshire and Essex, England. The central section between Paddington in central London and Abbey Wood in the south-east, is due to open in December 2018. It will later join with two existing routes operated by TfL Rail to become the Elizabeth Line, named after Queen Elizabeth II.
TfL Rail's Shenfield branch will be connected to Paddington in May 2019 and the branches west of Paddington will be connected to Crossrail's central core in December 2019. This will complete a new east–west route across London. It will provide a new high-frequency commuter and suburban passenger service.