The 91/Perris Valley Line, formerly known as the 91 Line, is a commuter rail route 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 route runs on the Southern Transcon line owned by BNSF Railway, as well as the Riverside County Transportation Commission-owned San Jacinto Branch Line. Services are primarily operated along the entire route between Union Station and South Perris while some trips use Downtown Riverside as a terminus.