Seattle’s Northgate Extension light-rail project: The $54-billion improvement and expansion project for Seattle’s light-rail infrastructure, called the Northgate Extension, was primarily a tunnel section that will accommodate an estimated daily ridership of 41,000 to 49,000 by 2022. For the project, public safety and seamless communication with the rest of the systems were priorities. The project needed an innovative product that would work well in the confined spaces and tunnels, and would seamlessly connect with outside plant, using standard couplers, tools, and installation techniques. The Northgate Extension project used more than 22,500 feet of Dura-Line’s 1-inch Low Smoke Zero Halogen conduit, which was reformulated and launched in 2018. The product offering’s low coefficient of friction provides less stress on the fiber cable, allowing for greater air-jetting installation distances. The installation crews, which worked between the hours of 1:30 and 3:30am for several days in order to complete the conduit installation, pulled the conduit in vault to vault. The 1-inch LSZH conduit were inserted into a larger 4-inch duct, which was encased in concrete and ran the entire length of the Northgate Extension, over 22,500 feet. The crew was able to air-jet fiber cable for the entire length from the safety of their access points. Air-jetting allowed the fiber cable to be inserted at 200 feet per minute. Future upgrades and changes can be made just as easily, from the safe access points, and avoiding disrupting the light rail schedule.