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 core commuter rail network consists of seven lines and 62 stations operating on 534 miles (859 km) of rail network. In addition, Metrolink also operates the 9-mile (14 km) Arrow hybrid rail (light rail with some features similar to commuter rail) line in San Bernardino County, under a contract with the San Bernardino County Transportation Authority, integrating another four stations to its network. In 2021, the system had a ridership of 2,642,200, or about 15,200 per weekday as of the third quarter of 2022. Metrolink connects with Los Angeles County's Metro Rail and Metro Busway systems, San Diego County's Coaster commuter rail and Sprinter hybrid rail services, and with Amtrak's Pacific Surfliner, Coast Starlight, Southwest Chief, Sunset Limited, and Texas Eagle intercity rail services. 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, started operation in 1992. Average weekday ridership was 42,928 as of 2017. It is operated by Amtrak under contract with the SCRRA.