A trio of regional politicians have joined forces to demand the Government makes a decision over the future of HS2.
West Midlands Mayor Andy Street, Manchester City Council leader Sir Richard Leese and his Leeds counterpart Judith Blake have all spoken in favour of the high-speed rail line in Parliament.
The trio, who represent three of Britain's biggest economic powerhouses outside London, were attending a meeting at the House of Commons with Transport Minister Chris Heaton-Harris.
Mr Heaton-Harris insisted the Government was yet to make a decision about whether to scrap HS2 even though a review into the proposed rail line led by its former chairman Douglas Oakervee completed its work last year.
Mr Street, who was a member of that review panel, said it was rather strange the Government was still refusing to publish the findings.
He said: "I am probably the only person in this room, other than the minister, who knows exactly what the Oakervee review says because I sat on it.
"What I am utterly confident of, having done the work on the review, is that there is a strong economic case which will eventually win through."
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He added that investors would feel betrayed if HS2 were scrapped now, after the first phase of the line, due to run between London and Birmingham, was approved by Parliament in 2015.
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"If you come to Birmingham what do you see? There is a hole in the ground where the station will be but the development from the private sector has already begun," he told the meeting.
"Just think if we didn't go ahead, what that would say.
"There are property investors from around the world who have invested on the good word of the British government and act of Parliament, that this would go ahead.
"If that does not, it would effectively be an incredible loss of trust in the eyes of those investors. Is that really what the British government wants to preside over?"
The first phase of HS2 is due to run between Birmingham and London and be open by 2031 while a second phase, between Birmingham and the East Midlands, North West and Yorkshire, is due for completion by 2040.
Last summer, the project was hit by a string of negative headlines including news that it was over budget and years behind schedule.
Mr Heaton-Harris said: "We hope to make that decision shortly, will publish the Oakervee review and based on that advice take a decision on whether to proceed as it stands, recast the project in places or consider alternatives."
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Labour Shadow Transport Secretary Andy McDonald said his party backed HS2.
He said: "Let there be no doubt about it. HM Opposition in two manifestos consistently have supported this project.
"So long as I am shadow transport secretary that will be the position of the party."