Back when BART was being planned in the 1960s, each Bay Area county decided whether or not to support it, and the original system (map) — as it existed from the 1970s to the 1990s — reflected the fact that both Marin and San Mateo Counties were left out of BART. (The stations built in San Mateo County south of Daly City station, connecting BART to San Francisco International Airport and to Caltrain in Millbrae, are the result of several whoops-I-guess-it’s-actually-a-good-idea votes in the late 90s.) This new map of all Bay Area rail (large .gif file) by SF Cityscape highlights Marin County’s isolation. (Courtesy CurbedSF)
It’s a local urban myth that snobbish Marin voters rejected BART because they feared it would bring the hoi polloi to its gentle shores. But the truth is more complicated. As told in the book “Paying the Toll: Local Power, Regional Politics, and the Golden Gate Bridge,” by Louise Nelson Dyble, the 1962 decision to eliminate Marin from the BART district was the result of Golden Gate Bridge District intransigence and indecision by the Marin County Board of Supervisors. Read a page of the book from the Google Books scan.