The Metropolitan Area Express (MAX) is a light rail system serving the Portland metropolitan area in the U.S. state of Oregon. Owned and operated by TriMet, it consists of five color-designated lines that altogether connect the six sections of Portland; the communities of Beaverton, Clackamas, Gresham, Hillsboro, Milwaukie, and Oak Grove; and Portland International Airport to Portland City Center. Service runs seven days a week with headways of between 30 minutes off-peak and three minutes during rush hours. In 2019, MAX had an average daily ridership of 120,900, or 38.8 million annually. Due to the COVID-19 pandemic, which impacted public transit use globally, annual ridership plummeted, with only 14.8 million riders recorded in 2021.
Fareless Square was an area within central Portland, Oregon, where all rides on TriMet buses and light rail and the Portland Streetcar were free. It primarily consisted of the downtown area and, after 2001, the Lloyd District. It existed from January 1975 through August 2012, but was briefly renamed the Free Rail Zone in January 2010 after its coverage became limited to light rail and streetcar service, with bus rides no longer being free. The TriMet board decided in June 2012 to discontinue the Free Rail Zone primarily to help fill a large shortfall in the agency's budget, and the action was one component of a package of extensive budget cuts which also included service reductions and fare increases. The Free Rail Zone ended on August 31, 2012.
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. An airport rail link, it connects Beaverton, Portland City Center and Northeast Portland to Portland International Airport. The line serves 26 stations; it interlines with the Blue Line and partially with the Green Line from Beaverton Transit Center to Gateway/Northeast 99th Avenue Transit Center and then branches to the 5.5-mile (8.9 km) Airport MAX segment to Portland International Airport station. The Red Line carried an average 10,310 passengers per weekday in September 2021, the second-busiest MAX service after the Blue Line. Its trains run for 22 hours per day with headways of up to 15 minutes.
East 122nd Avenue station is a MAX light rail station in Portland, Oregon. It serves the Blue Line and is currently the 16th stop eastbound on the Eastside MAX branch. The MAX system is owned and operated by TriMet, the major transit agency for the Portland metropolitan area.
The MAX Yellow Line is a light rail service in Portland, Oregon, United States, operated by TriMet as part of the MAX Light Rail system. It connects North Portland to Portland City Center and Portland State University (PSU) with 17 stops from Expo Center station to PSU South/Southwest 6th and College station. The line travels from Portland Expo Center in the north, south to the Rose Quarter through a 5.8-mile (9.3 km) light rail segment along the median of Interstate Avenue. From the Rose Quarter, it crosses the Willamette River via the Steel Bridge and enters downtown Portland, where it operates as a northbound-only service of the Portland Transit Mall on 6th Avenue. Service runs for approximately 21 hours daily with a headway of 15 minutes during most of the day.
The Gateway/Northeast 99th Avenue Transit Center, commonly known as Gateway Transit Center, is a TriMet bus transit center and light rail station on the MAX Blue, Green and Red Lines in Portland, Oregon, United States. It is the 14th stop eastbound on the current Eastside MAX. This station is where all three lines split, with Blue Line trains proceeding east to Gresham, Green Line trains proceeding south to Clackamas, and Red Line trains proceeding north to Portland International Airport. When opened in 1986, it was the busiest station on the Portland–Gresham MAX line, the only line in the system at that time, and was the terminus of 11 bus lines. Currently seven bus lines serve the Gateway Transit Center.
Northeast 60th Avenue is a light rail station on the MAX Blue, Green and Red Lines in Portland, Oregon. It is the 12th stop eastbound on the eastside MAX line. It is located on the boundary between the North Tabor and Rose City Park neighborhoods.
Hollywood/Northeast 42nd Avenue Transit Center, also known as Hollywood Transit Center, is a light rail station in the MAX Light Rail system and is located in the Hollywood District of Portland, Oregon. It is the 11th stop eastbound on the eastside MAX main line. It is served by the Blue, Green and Red Lines, of TriMet. It is also a transit center, served by three TriMet bus routes.
Lloyd Center/Northeast 11th Avenue is a light rail station on the MAX Blue, Green and Red Lines in Portland, Oregon. It is the 10th stop eastbound on the Eastside MAX. The station is located on the 1200 block of Northeast Holladay Street in Lloyd District.
Library/Southwest 9th Avenue and Galleria/Southwest 10th Avenue are light rail stops on the MAX Blue and Red Lines in Portland, Oregon. It was the original western terminus and is now the Eastside MAX line's first stop eastbound/last stop westbound in downtown.
The Sunset Transit Center is a TriMet bus transit center and light rail station on the MAX Blue and Red lines in Beaverton, Oregon. It opened for MAX in 1998 and is the 5th stop westbound on the Westside MAX. This is the first stop after the Robertson Tunnel under Portland's West Hills. Sunset TC is the second-busiest station on the Westside MAX line, with a weekday average of almost 6,000 daily riders in 2012. Though the station has a Portland address, it primarily serves residents of the communities of Cedar Hills, Cedar Mill, and Beaverton.
Parkrose/Sumner Transit Center is a TriMet transit center and light rail station on the MAX Red Line in Portland, Oregon. It is the fourth stop north on the Airport MAX branch, and consists of an island platform in the median of Interstate 205. The entrance and exit to the transit center are on Sandy Blvd. near 95th Avenue, in the Parkrose neighborhood and east of the Sumner neighborhood.
Portland International Airport, or just Airport on station signage, is a light rail station in Portland, Oregon, United States, served by TriMet as part of the MAX Light Rail system. It serves Portland International Airport as the eastern terminus of the Red Line, which connects travelers to downtown Portland and Beaverton. The station is attached to ground floor of the main passenger terminal, near the southern end of the arrivals hall and baggage claim area. It features a wedge-shaped island platform, just beyond which both tracks join because the section approaching the terminal is single-tracked.
Interstate/Rose Quarter station is a light rail station on the MAX Yellow Line in Portland, Oregon. It is the first stop northbound on the Interstate MAX extension. About 200 yards away is the Rose Quarter Transit Center's MAX station, where transfers to the eastbound MAX Blue and Red lines and the southbound Green Line are possible. Several bus lines also serve the transit center, making stops in the area between the two MAX stations.
Overlook Park is a light rail station in Portland, Oregon, United States, served by TriMet as part of the MAX Light Rail system. It is the eighth station southbound on the Yellow Line, which operates between North Portland, downtown Portland and Portland State University. The staggered side platform station is situated between the intersections of Fremont Street and Overlook Boulevard along the median of North Interstate Avenue, near the Interstate Medical Offices of Kaiser Permanente and a park with the same name. It is one of three stations serving North Portland's Overlook neighborhood along with North Prescott Street and North Killingsworth Street. Overlook Park station opened on May 1, 2004, as part of the Interstate MAX extension. Trains serve the station for approximately 21 hours per day on a headway of 15 minutes during most of the day.
North Lombard Transit Center is a light rail station on the MAX Yellow Line in Portland, Oregon. It is the 7th stop northbound on the Interstate MAX extension.
The MAX Green Line is a light rail service in Portland, Oregon, United States, operated by TriMet as part of the MAX Light Rail system. It is 15 miles (24.1 km) long and serves 30 stations from the PSU South stations to Clackamas Town Center Transit Center; it connects Portland State University (PSU), Portland City Center, Northeast Portland, Southeast Portland, and Clackamas. The Green Line is the only service that shares parts of its route with the four other MAX services, sharing the Portland Transit Mall with the Orange and Yellow lines and the Banfield segment of the Eastside MAX with the Blue and Red lines. Southbound from Gateway/Northeast 99th Avenue Transit Center, it operates the Interstate 205 (I-205) segment through to Clackamas Town Center. Service runs for approximately 211⁄2 hours daily with a headway of 15 minutes during most of the day. It is the third-busiest line in the system, carrying an average of 19,160 riders per day on weekdays in September 2019.
The Lloyd District is a primarily commercial neighborhood in the North and Northeast sections of Portland, Oregon. It is named after Ralph Lloyd (1875–1953), a California rancher, oilman, and real estate developer who moved to and started the development of the area.
The Rose Quarter is a 30-acre (12-hectare) sports and entertainment district located in Portland's Lloyd District on the east bank of the Willamette River, just east of downtown. The Rose Quarter is bounded on the west by NE Interstate Avenue, on the north by NE Broadway and NE Weidler Streets, on the east by Interstate 5, and on the south by NE Holladay Street. The site contains two multipurpose arenas, the Moda Center and the Memorial Coliseum. Nearby landmarks include the Steel and Broadway bridges, the Oregon Convention Center, and the Eastbank Esplanade.
The Portland Transit Mall is a 1.2-mile (1.9 km) public transit corridor that travels north–south through the center of downtown in Portland, Oregon, United States. It comprises a pair of one-way streets—6th Avenue for northbound traffic and 5th Avenue for southbound—along which two of three lanes are restricted to transit buses and light rail vehicles only. As of September 2022, the corridor is served by the Green, Orange, and Yellow lines of MAX Light Rail; Frequent Express; and over a dozen local bus routes, all of which are services of TriMet, the transit agency operating within the Oregon side of the Portland metropolitan area. C-Tran, the transit agency for Clark County, Washington, additionally serves it with two express bus routes—#105 I-5 Express and #164 Fisher’s Landing Express.
Yellow Line at Interstate/Rose Quarter 
