Metrolink (California)

Metrolink (reporting mark SCAX) is a commuter rail system in Southern California, serving Los Angeles, Orange, Riverside, San Bernardino, and Ventura counties, as well as to Oceanside in San Diego County. The system consists of eight lines and 69 stations operating on 545.6 miles (878.1 km) of track. This includes Arrow, which Metrolink operates under a contract with the San Bernardino County Transportation Authority (SBCTA).

In 2024, the system had a ridership of 5,647,700, or about 19,700 per weekday as of the first quarter of 2025.

Metrolink connects with Los Angeles County's Metro Rail and Metro Busway systems, North County Transit District's Coaster commuter rail and Sprinter hybrid rail services, and with Amtrak's Pacific Surfliner, Coast Starlight, Southwest Chief, Sunset Limited, and Texas Eagle inter-city rail services. Metrolink owns several hundred miles of track; however, it also shares track with freight railroads.

The system, founded in 1991 as the Southern California Regional Rail Authority (SCRRA) and adopting "Metrolink" as its moniker, started operation in 1992. Average weekday ridership was 42,928 as of 2017. The SCRRA contracts with Amtrak to operate the trains and Alstom to maintain the rolling stock (locomotives and passenger cars). This is scheduled to change on July 1, 2025 when Alstom will also take over operating the trains.