The Supreme Court has rejected a legal challenge by objectors that the government was 'cutting corners" to push HS2.
It was argued that the parliamentary bill procedure being used by MPs was inappropriate.
Seven Supreme Court justices rejected it.
They ruled, "There is no reason to suppose that MPs will be unable properly to examine and debate the proposed project."
Transport Minister Baroness Kramer has 'welcomed' the decision made by the court.
She said, "The government's handling of the project has been fully vindicated by the highest court in the land.
"We will now continue to press ahead with the delivery of HS2."
A woman who nearly drowned during a school swimming lesson in Essex 13 years ago has won a landmark ruling from the UK's highest court, which paves the way for her to pursue compensation from a local education authority.
Annie Woodland was a pupil at Whitmore Junior School in Basildon when she had to be pulled from the water and resuscitated at Gloucester Park pool in July 2000.
Ms Woodland, now in her 20s, suffered severe brain damage.
In October 2011 a High Court judge threw out Ms Woodland's claim against Essex County Council on the basis that it was bound to fail, a view backed in a majority ruling by Court of Appeal judges.
Supreme Court justices in London have today allowed her appeal against those findings.
Annie Woodland, who suffered severe brain damage when she nearly drowned during a school swimming lesson in Basildon, Essex 13 years ago, has won a landmark Supreme Court ruling today in her battle for compensation against a local education authority.