MAX Orange Line (TriMet)

The MAX Orange Line is a light rail line serving the Portland metropolitan area in the U.S. state of Oregon. Operated by TriMet as part of MAX Light Rail, it connects Portland City Center, Portland State University (PSU), Southeast Portland, Milwaukie, and Oak Grove. The line serves 17 stations running north–south from Union Station/NW 5th & Glisan station to SE Park Ave station. Within the Portland Transit Mall, the Orange Line operates through to the Yellow Line northbound and shares the southbound tracks with the Green Line. Trains run for 21 hours per day with peak-hour headways of 15 minutes. Ridership averaged 5,025 per day on weekdays in July 2025.

The Portland–Milwaukie Light Rail Project (PMLR) began construction in 2011 following decades of failed light rail plans for the McLoughlin Boulevard (Oregon Route 99E) corridor. The ten-station, 7.3-mile (11.7 km) extension was the second and final phase of the South Corridor Transportation Project, which expanded light rail to Interstate 205 (I-205) and the Portland Transit Mall in its first phase. As part of the PMLR project, TriMet built Tilikum Crossing, the largest "car-free" bridge in the United States, over the Willamette River. Orange Line service commenced on September 12, 2015.