This was a design build project that spans three regional express railway stations and a major road crossing in Unionville, Milliken, and Agincourt Ontario. System-wide RER infrastructure upgrades included: adding tracks, expanding stations, electrification of the rail network, new locomotives and train control systems to enable more frequent service. The Agincourt GO station was a demolition and new build of the station building and platforms. The Milliken Go station consists of the construction of new platforms and upgrades to the exterior of the existing station building. The Unionville Go station work included the construction of a new island platform, track and signal work, and addition of a new parking area.