public transportation. The Gateway Transit Center includes the station itself and the Patsaouras Transit Plaza, both of which were designed by Ehrenkrantz & Eckstut, along with the western terminus of the El Monte Busway, as well as Metro's headquarters building. , Amtrak and Metrolink share 12 of Union Station's 14 outdoor tracks, with 94 trains departing on most weekdays (95 on Wednesday, 96 on Friday). Services Amtrak Amtrak long-distance routes Union Station is the western terminus for four of Amtrak's long-distance trains: Coast Starlight, to Seattle (daily, service began 1971) Southwest Chief, to Chicago (daily, service began 1939 as Super Chief, renamed Southwest Limited in 1974 and Southwest Chief in 1984) Sunset Limited, to New Orleans (tri-weekly, service began 1939) Texas Eagle, to Chicago (tri-weekly, service began 1982): Runs combined with the Sunset Limited to San Antonio, where the train is split. Amtrak California regional routes Amtrak California operates multiple-times-daily regional rail services to cities across the state: Pacific Surfliner, from San Diego to San Luis Obispo via Los Angeles (service began 1939 as San Diegan, renamed Pacific Surfliner in 2000): 13 daily round trips, most of which originate and terminate here; three run to Goleta and two run to San Luis Obispo. Connections to the San Joaquin to Oakland or Sacramento are provided through Amtrak Thruway Motorcoach services. (see below) Metrolink The station is the hub for Metrolink and six of Metrolink's seven lines serve the station: Antelope Valley Line, to Lancaster (service began 1992) Riverside Line, to Riverside (service began 1993) Orange County Line, to Oceanside (service began 1990 as the Amtrak Orange County Commuter) San Bernardino Line, to San Bernardino (service began 1992) Ventura County Line, to Ventura (service began 1992) 91/Perris Valley Line, to Perris (service began 2002) Metro Rail Three Metro Rail lines (the B (Red), D (Purple), and L (Gold) Lines) serve the station with about 300 Metro Rail trains departing every weekday. Metro B Line/Metro D Line The Metro B and Metro D subway lines have their eastern terminus at Union Station and share two tracks below Union Station. There are two entrances to the platform: one is located inside Union Station's main concourse on the west side of the complex, near Alameda Street, and the other is located near the Patsaouras Transit Plaza on the east side of the complex. Metro L Line The Metro L Line (Gold) is a light rail