The San Francisco Bay Area Rapid Transit District ( BART ) is a heavy-rail public rapid-transit system serving the San Francisco Bay Area. The acronym BART is pronounced as a word, not as individual letters. It opened for service on September 11, 1972, with the first line being Fremont. It was a replacement for the Key System, which ran streetcars across the lower deck of the San Francisco Bay Bridge until 1958. Today, BART has 104 miles of track around the Bay Area, running from Fremont into Oakland, San Francisco and then south again to the San Francisco Airport and Millbrae. BART carries more than 300,000 passenger trips every weekday. There are plans for an extension to Silicon Valley, ending in Santa Clara, Cal. with a projected increase in ridership.

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