Crossrail is among the most significant infrastructure projects ever undertaken in the UK. While much of Crossrail was focused on tunnels under London, there were some significant upgrades carried out on existing railways such as at Stockley Flyover, the upgrade of which allows trains to join the Heathrow branch without delaying fast trains to the west. Concast provided main contractor Carillion with approximately 2,500 linear meters of robust parapet units all of which incorporated a Reckli mat decorative finish and a rear service trough detail. Concast’s parapet units were positioned for a total distance of 1.25 km on both sides of the new corten steel bridge section. The parapets are heavily reinforced and designed to contain a potential train derailment. Individual Precast element weights ranged from 6 to 40T. Concast provided the parapets in two phases over an 18 month period which included deliveries for Christmas holiday installations.