HS2 engineers have completed three major structures on the southern approach to Interchange station, in the West Midlands. The viaducts – in Balsall Common, Marsh Farm and River Blythe – are all within the Solihull metropolitan borough. The main structure of Balsall Common Viaduct was finished earlier this year, and all 304 parapets will be installed by spring 2027. Both the River Blythe Viaduct and Balsall Common Viaduct are ‘Key Design Elements’ (KDEs), which means their size, proximity to communities, or location within sensitive areas, marked them out as significant. Balfour Beatty Vinci construction manager Matthew Parkes said: “The structural completion of these viaducts is a another huge achievement for Balfour Beatty Vinci and its supply chain partners.