Construction consultancy Davis Langdon has been appointed by the Government's advisory body HS2 to produce a cost and risk model for the project aimed at bringing high speed rail to the North West.
HS2 has awarded Davis Langdon with the work to support the economic case for the proposed Y-shaped national high speed rail network linking London to Birmingham, Manchester and Leeds, with trains running at up to 250 miles an hour.
The project would also reduce journey times between the Channel Tunnel and Heathrow.
Lindsay Noble, Davis Langdon's head of rail, said: "In addition to the reduced travel times, the line will increase network capacity, enhance integration of new and existing transport links across the country and provide significant opportunities for business development across all sectors."
The proposed Y-shaped network and the high speed rail line from London to the West Midlands are currently under public consultation which is due to end on 29 July.
The appointment was secured in part by drawing on AECOM's combined global high-speed rail experience which will see Davis Langdon working closely with experts from AECOM as well as INOCSA, AECOM's Madrid-based transportation high speed centre of excellence.
High Speed 2 would cost £32bn to build and is estimated to generate benefits of £44bn and revenues totalling £27bn.