A Line (Los Angeles Metro)
The A Line is a 22-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.