SCRRA

The system operates in Los Angeles, Orange, Riverside, San Bernardino, and Ventura counties, as well as to Oceanside in San Diego County.

[5][6] It connects with the Los Angeles County Metro Rail and Metro Busway system, the San Diego Coaster commuter rail and Sprinter light rail services, and with Amtrak's Pacific Surfliner, Coast Starlight, Southwest Chief, Sunset Limited, and Texas Eagle intercity rail services.

[7] Metrolink owns several hundred miles of rail; however, it also shares some track with freight trains.

The system, founded in 1991 as the Southern California Regional Rail Authority (SCRRA) and adopting "Metrolink" as its moniker,

[8] started operation in 1992. Average weekday ridership was 42,928 as of 2017.

[4] It is operated by Amtrak under contract with the SCRRA.

Metrolink operates several maintenance facilities across its service area.

Its Keller Yard Central Maintenance Facility (CMF) is located on the east bank of the Los Angeles River near the intersection of the 5 and 110 Freeways, just south of the location of the former Southern Pacific Taylor Yard.

[91] The facility is operated by Metrolink's equipment maintenance contractor: Bombardier Transportation.

[92] The Eastern Maintenance Facility is located in San Bernardino. Metrolink trains are also serviced at Coaster's Stuart Mesa Facility, which is located between San Clemente Pier and Oceanside at the southwest end of Camp Pendleton.

This yard is owned by the North County Transit District.[92]

Metrolink's operations center is located in Pomona, near the Pomona (North) station.[93]