Since 1992, Metrolink has provided Southern California drivers a safe, convenient alternative to driving. As drivers choose Metrolink, traffic is relieved and air quality is improved. Metrolink is governed by the Southern California Regional Rail Authority (SCRRA), a joint powers authority made up of an 11-member board representing the transportation commissions of Los Angeles, Orange, Riverside, San Bernardino and Ventura counties. Metrolink trains operate on seven routes across a six-county, 536 route-mile network, which includes a portion of northern San Diego County.