The Crossrail transit line is the railroad system being constructed since 2009 in London. The largest construction project in Europe. It is planned that a new kind of metropolitan public transport will connect urban areas, as well as eastern and western suburbs. The line will connect Shenfield and Abbey Wood in the east and Heathrow and Reading in the west. Below you will find information about Crossrail, which may be interesting for you.
When the Crossrail opens.
Officially Crossrail will open in December 2018, when trains will start to run between Paddington and Abbey Wood, between Liverpool Street and Shenfield and between Paddington and Heathrow.
But: Crossrail trains have already started operating in the summer of 2017. They run from Liverpool Street along the Shenfield line, which is now managed by the TfL Rail Public Transportation Operator;
in May 2018, the TfL Rail trains will begin to run between Paddington and Heathrow, replacing the Heathrow Connect railway operator and affecting part of the Great Western railway network;
in May 2019 direct trains will begin to run between Paddington and Shenfield and Paddington and Abbey Wood;
the Elizabeth line will be fully operational in December 2019, when the trains will begin to run to Reading.
More detailed information can be found here.