The A Line (formerly the Blue Line) is a 22.0-mile (35.4 km) light rail line running north–south between Los Angeles and Long Beach, California, passing through Downtown Los Angeles, South Los Angeles, Watts, Willowbrook, Compton, Rancho Dominguez, and Long Beach in Los Angeles County. It is one of six lines in the Metro Rail system. Opened in 1990, it is the system's oldest and third-busiest line with an estimated 22.38 million boardings per year as of December 2017. It is operated by the Los Angeles County Metropolitan Transportation Authority. The A Line passes near the cities of Vernon, Huntington Park, South Gate, Lynwood, and Carson. The famous Watts Towers art installation is visible from the train tracks near 103rd Street station. The under-construction Regional Connector will directly link this line to Union Station and into the San Gabriel Valley along the current route of the L Line. Rolling stock Trains run in 2–3 car consists Kinkisharyo P3010 Siemens P2000 Nippon Sharyo P2020
