Los Angeles Metro Rail

Metro Rail is an urban rail transit system serving Los Angeles County, California, United States, consisting of six lines: four light rail lines (the A, C, E, and K lines) and two rapid transit lines (the B and D lines), serving a total of 107 stations (24 underground, 6 trenched, 57 at grade, and 23 elevated). The system connects with the Metro Busway bus rapid transit system (the G and J lines), the Metrolink commuter rail system, as well as several Amtrak lines. Metro Rail is owned and operated by Los Angeles Metro.

Metro Rail has been extended significantly since it started service in 1990, and several further extensions are either in the works or being considered. In 2025, the system had a ridership of 68,764,300 or about 209,300 per weekday as of the fourth quarter of 2025. Metro Rail operates the busiest light rail system in the United States.

Los Angeles had two previous rail transit systems, the Pacific Electric Red Car and Los Angeles Railway Yellow Car lines, which operated between the late 19th century and the 1960s. The Metro Rail system uses many of their former rights of way, and thus can be considered their indirect successor.