Civils firms have been invited to compete for more than £500M of work on phase 2B of High Speed 2.
Project promoter HS2 Ltd published pre-qualification questionnaires for four packages of work on the Crewe-to-Manchester and Birmingham-to-Leeds legs of the £55bn rapid rail link.
Shortlists are expected to be drawn up for these roles over the summer, with contract awards next winter following a formal route decision, expected from ministers this autumn.
HS2 Ltd is seeking a phase 2b development partner, under a deal worth up to £170M.
It has also advertised up to £350M of professional services consultancy work split into three packages: engineering and environment; railway systems; and site access and land referencing.
CH2M Hill was appointed four years ago for the £50M to £70M development partner role on phase 1 of HS2.
Meanwhile, nine teams were last week shortlisted for up to £11.8bn of civils work on phase 1 and potentially 2A of HS2.
Chancellor George Osborne last year announced that the Birmingham to Crewe leg of the rapid rail link would open in 2027 – just a year after the first phase from London to Birmingham.
The rest of the second phase - from Crewe to Manchester; and from Birmingham to Leeds - is not expected to be operational until 2033.