 High-speed lines north of the West Midlands would be built in later stages, and a link to Heathrow Airport would be initially provided by a connection at Old Oak Common, with a high-speed link to the airport to be added later.The high-speed line would connect to the existing network, allowing through trains from London to northern destinations.The consultation documents were published on 11 February 2011 with the consultation period set to run until July 2011.