The Grand Paris Express is transforming mobility across Paris with 200 km of new metro routes and 68 stations, expanding one of the largest metro networks in the world. On this section of Line 15, the scale and diversity of the project brings together tunnels, technical facilities, fully integrated stations, and 15 partner companies working across multiple disciplines. Dalux and BIM has played a central role throughout the project, supporting coordination and collaboration from design through to delivery. The platform provides an intuitive and accessible platform for engineers, quality teams, control offices, and others to collaborate and work with a reliable and up to date information throughout the entire construction project.