The Ontario Line is an ambitious new subway line in Toronto, Canada that will help radically transform public transit across the city. It consists of 15.6 kilometers of new railway infrastructure and 15 new stations. The line will cut down journey times while reducing congestion to the existing wider Toronto area. Working together as a combined technical advisor, Mott MacDonald and HDR had to efficiently manage and share reliable data across multiple contracted organizations.  The teams used the iTwin Platform to provide quick, web-based access to the latest models, while ProjectWise served as the connected data environment. SYNCHRO and Bentley LumenRT helped improve 4D modeling and visualization capabilities, improving communication with the team and third-party stakeholders. ProjectWise reduced time to access files by 50% while also saving 15 hours per week in checking and reporting file status. By using SYNCHRO, the team was 60% more efficient with their constructability and scheduling meetings. When complete, the Ontario Line is expected to take 28,000 cars off the road, saving 7.2 million liters of fuel annually.