Multiple Levels at SFO

San Francisco International Airport  is one of the busiest passenger facilities in the country, and its transportation access has been massively upgraded in recent years.  A people-mover, known as AirTrain, serves all the terminals and also provides access to the car rental area, located some distance away. 

AirTrain uses the top level visible in this photo, and BART occupies the next level down.  A joint station, with its curved roof partially visible behind where one branch of AirTrain veers off to the right, allows BART passengers to continue on to their specific airport destinations on the circulator.

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