The central section of Crossrail 2 requires 36km of new railway, 13 underground stations and two surface stations. There will be new connections to the existing mainline and London Underground networks at Euston, Tottenham Court Road and Victoria.

The initial commission for phase 1 is to develop a multi-disciplinary engineering feasibility and cost study in order to select a preferred route, which will be taken to public consultation for a Comprehensive Spending Review (CSR) application to the Department for Transport (DfT).

This will enable TfL to progress to phase 2, which includes statutory consultation in 2016; and phase 3, with the aim of completing client and authority approvals by December 2017. Design and implementation phases will follow, with construction of the new line due to commence in 2020.

"We have won this competitively tendered project against a number of very capable teams, thanks to the combined engineering strength of Hyder and Arcadis, coupled with the commercial advisory services offered by EC Harris," says Mr Stephan Ritter, executive board member of Arcadis.