The MAX Red Line is a light rail service in Portland, Oregon, United States, operated by TriMet as part of the MAX Light Rail system. It serves 26 stations between Beaverton and Portland, running predominantly east–west. An airport rail link, the line connects central Beaverton, Portland City Center, and Northeast Portland to Portland International Airport. From Beaverton Transit Center to Gateway/Northeast 99th Avenue Transit Center, the Red Line shares its route with the Blue Line and the Green Line; it then splits to a segment to Portland International Airport station, referred to as the Airport MAX extension. Service runs for 22 hours per day on a headway of at least 15 minutes daily. It is the second-busiest service in the MAX system, carrying an average of 22,530 passengers per weekday in September 2019.