Tory MP for North West Leicestershire, Andrew Bridgen, says that his party's HS2 endeavour "will be detrimental for economical growth and cause a lot of fear."
The 225mph passenger train is one of the coalition's priority projects.
An influential group of MPs says the DfT has failed to present 'a convincing strategic case' for HS2.
Campaigners say they hope to put plans for HS2 through the Midlands back to square one as they prepare to go to the High Court tomorrow.
Campaigners from HS2 Action Alliance are heading to London tomorrow to take on the Government at the Court of Appeal.