A Bay Area Rapid Transit (BART) train enters the platform area at the Rockridge station in Oakland, California February 12, 2015. Tens of thousands of commuters on San Francisco\'s Bay Area Rapid Transit system may have been exposed to measles after an infectious Bay Area resident rode a train to and from work for three days last week, public health officials said on Wednesday. REUTERS/Robert Galbraith (UNITED STATES - Tags: TRANSPORT HEALTH) (credit:Robert Galbraith / Reuters)
USA-MEASLES/(02 of14)
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A Bay Area Rapid Transit (BART) train approaches the platform area at the Rockridge station in Oakland, California February 12, 2015. Tens of thousands of commuters on San Francisco\'s Bay Area Rapid Transit system may have been exposed to measles after an infectious Bay Area resident rode a train to and from work for three days last week, public health officials said on Wednesday. REUTERS/Robert Galbraith (UNITED STATES - Tags: TRANSPORT HEALTH) (credit:Robert Galbraith / Reuters)
USA-MEASLES/(03 of14)
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A Bay Area Rapid Transit (BART) train enters the platform area at the Rockridge station in Oakland, California February 12, 2015. Tens of thousands of commuters on San Francisco\'s Bay Area Rapid Transit system may have been exposed to measles after an infectious Bay Area resident rode a train to and from work for three days last week, public health officials said on Wednesday. REUTERS/Robert Galbraith (UNITED STATES - Tags: TRANSPORT HEALTH) (credit:Robert Galbraith / Reuters)
USA-MEASLES/(04 of14)
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Passengers await the arrival of a Bay Area Rapid Transit (BART) train at the Rockridge station in Oakland, California February 12, 2015. Tens of thousands of commuters on San Francisco\'s Bay Area Rapid Transit system may have been exposed to measles after an infectious Bay Area resident rode a train to and from work for three days last week, public health officials said on Wednesday. REUTERS/Robert Galbraith (UNITED STATES - Tags: TRANSPORT HEALTH TPX IMAGES OF THE DAY) (credit:Robert Galbraith / Reuters)
USA-MEASLES/(05 of14)
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Passengers board a Bay Area Rapid Transit (BART) train at the Rockridge station in Oakland, California February 12, 2015. Tens of thousands of commuters on San Francisco\'s Bay Area Rapid Transit system may have been exposed to measles after an infectious Bay Area resident rode a train to and from work for three days last week, public health officials said on Wednesday. REUTERS/Robert Galbraith (UNITED STATES - Tags: TRANSPORT HEALTH) (credit:Robert Galbraith / Reuters)
USA-RAIL/STRIKE(06 of14)
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A woman waits for a MUNI train at the Embarcadero station as 2,400 employees of the Bay Area Rapid Transit (BART) commuter rail system go on strike in San Francisco, California July 1, 2013. Commuter rail workers went on strike on Monday in the San Francisco area for the first time in more than 15 years, triggering gridlock on highways and headaches for thousands trying to get to work. REUTERS/Robert Galbraith (UNITED STATES - Tags: TRANSPORT BUSINESS EMPLOYMENT) (credit:Robert Galbraith / Reuters)
Trains(07 of14)
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Two BART trains pulling into MacArthur station in Oakland, California. (credit:Preeti Pradhan via Getty Images)
Trains(08 of14)
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BART with a Monterey Bay Aquarium advertisement covering a train car. In Oakland, California. (credit:Preeti Pradhan via Getty Images)
Trains(09 of14)
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Berkeley BART station as a train approaches. (credit:Preeti Pradhan via Getty Images)
Trains(10 of14)
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Train leaves the station at Berkeley BART. (credit:Preeti Pradhan via Getty Images)
Trains(11 of14)
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BART pulling into Rockridge station in Oakland, California. (credit:Preeti Pradhan via Getty Images)
Trains(12 of14)
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BART train at Rockridge station, Oakland, California (credit:Preeti Pradhan via Getty Images)
Trains(13 of14)
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BART train leaving Rockridge station in Oakland, California. (credit:Preeti Pradhan via Getty Images)
Trains(14 of14)
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BART train pulling into MacArthur station in Oakland, California. (credit:Preeti Pradhan via Getty Images)