Rail connections to Los Angeles, the Inland Empire, and Northern San Diego County are provided by the Metrolink regional commuter rail network. The Orange Metrolink station's platform is situated adjacent to the former Santa Fe depot in the downtown Historic District, which is also home to an Orange County Transportation Authority (OCTA) bus station, is the second busiest station of the entire Metrolink train system due to its position serving as a transfer station for the Orange County and the IEOC Metrolink lines. The former Santa Fe mainline links the cities of Los Angeles, Riverside, and San Diego via a junction north of the station.