The 91/Perris Valley Line, formerly known as the 91 Line, is a commuter rail line operated by Metrolink that runs from Los Angeles to Perris in Southern California, paralleling State Route 91 between Riverside and Santa Fe Springs. Operating since May 2002, the line runs on the Southern Transcon track owned by BNSF Railway, as well as the Riverside County Transportation Commission-owned . Services are primarily routed through the whole line between Union Station and South Perris while some trips use Downtown Riverside as a terminus.