The move will save around 70,000 cubic metres of concrete – the equivalent to 6,700 concrete mixer lorry loads – and around 420,000 tonnes of carbon.
The railway will pass through Streethay in a cutting and the shortening of the retaining structures also means local residents will experience less noise and disruption during construction by main contractor BBV.
Andy deBell, Head of Stakeholder Engagement for BBV, said: “We’re pleased to confirm these new and improved design changes, which we’ve introduced after working closely with the local community.
“This new design will see the HS2 line pass underneath the A38 and neighbouring railway line, bringing significant environmental and community benefits.”