The news comes as enabling work on the route from London to Birmingham continues to gather pace, with activity on over 250 work sites.
Over 2,000 firms across the UK now have contracts with HS2, 70% of them SMEs.
At peak construction, over 30,000 people will be needed to design and build the railway.
Transport Secretary Chris Grayling said: “Today’s announcement shows HS2 is happening and is yet another example of how this government is making sure Britain works for everyone, delivering jobs and growth across the country.”
Mark Thurston, Chief Executive of HS2, said: “HS2 is more than a railway, it’s also an opportunity to leave a lasting legacy for the country. The jobs and skills that we will create in every corner of the country will give us an industry to be proud of, and one that we can export to other countries.”