The five-year contract begins immediately with work set to start on the first 50 miles of track from Birmingham to Crewe.
A team of engineers and planners will provide railway systems services, including engineering design, construction planning, operations planning, expert advice, detailed modelling, systems engineering and assurance.
Darren Reed, head of rail, said: “Our appointment is testament to the quality of the work delivered by our team for HS2 Phase 1, where we designed a safe, affordable and maintainable high-speed rail system that integrates effectively with the existing rail network.
“We will build on this success and use our extensive international high-speed rail expertise to deliver a design for Phase 2 that supports HS2’s vision of a world-leading, transformational rail system that will bring lasting benefits for many generations.”
This appointment follows the company’s role as railway systems consultant on Phase 1 of the project where it provided rail systems design and development work and helped HS2 Ltd to deposit a hybrid Bill to Parliament in just 18 months.
The firm’s recent work around the world including the Cologne-Rhine Main Line, Shijiazhuang-Taiyuan High Speed Rail, Taiwan High Speed Rail and Zheng-Xi High-Speed Rail also helped it land the work.