Politicians have been told to get behind the high speed rail link or risk costs spiralling out of control.
The chairman of HS2, Sir David Higgins, has published his first report on the project since he took up the role at the beginning of the year.
He's warned the £50 billion cost of the project will escalate if it gets bogged down in parliamentary infighting.Sir David has recommended bringing forward construction of the West Midlands to Manchester stretch of the line from a start date of 2026.
The Transport Secretary Patrick McLoughlin is expected in Manchester to address people's concerns over the HS2 high-speed rail link.
Earlier this week, the Supreme Court ruled the Government wasn't cutting corners to get the controversial project through Parliament.
Supporters of the proposed scheme say it'll reduce journey times between the north west and London and create jobs. But there are concerns about the effect the new line may have on the environment.
The Transport Secretary has defended the controversial HS2 high-speed rail project which has come under criticism from campaigners, Labour, and the public accounts committee.
Patrick McLoughlin said: "Any big major infrastructure project like this will led to criticism, of course it will. you're not going to build 350 miles of new railway and not have criticism.
"There is a sceptism with government ministers promising a glorious future which is some way a way down the line, unless we make these type of decisions now we don't get it."
Transport Secretary Patrick McGloughlin today said HS2 will "deliver growth and jobs across the country".
At a speech at the Institute of Civil Engineers he responded to backlash earlier this week that the train will take business away from the regions.
A spokesman for HS2 Action Alliance said that the Government's "need for a political legacy" has overcome the need for an improvement of existing rail services. Richard Houghton said:
The Department for Transport has been tweeting extracts from Transport Secretary Patrick McLoughlin's speech about the HS2 high-speed rail project:
Opponents of the proposed High Speed Rail link - or HS2 - say they're delighted an influential committee of MPs has heavily criticised the plan.
The idea of HS2 is to provide much quicker rail links between London and cities like Manchester, Liverpool and Birmingham.
But the £42 billion scheme has come under attack from the Parliamentary Public Accounts Committee.
Supporters of HS2 say it's vital for the region's economy in future years.
Our Political Reporter Daniel Hewitt has more:
@DanielHewittITV: On cost @SirRichardLeese says HS2 'cant be a blankcheque' but says there's no alternative that will deliver capacity,growth & connectivity