They say the £11 billion Crossrail scheme "sells London short" and will not relieve congestion on the Tube. Competition between Crossrail and its rival Superlink increased as MPs prepared to debate Crossrail before Parliament is suspended for the election. Dr John Prideaux, chairman of Superlink, said: "Our scheme does more to relieve congestion as well as providing faster and more effective links with regional centres and airports." He added the £13 billion project would carry four times as many passengers as Crossrail.