Anti-HS2 campaigners are taking on the Government at the Court of Appeal today.
They are objecting to the environmental impact of the planned high speed rail line through the Midlands.
The Department for Transport says it will defend any challenges to the project.
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.