Yup. The system has expanded. Both in the north (that yellow line section) and in San Mateo county to the Airport (which until recently, had very disappointing ridership numbers for an extension that cost billions).
Now, if this tax passes (with the suspicious surge that makes it close to passing), it will take BART one step closer to ‘completing’ one of their long time dreams. BART around the bay.
At first Concord and Daly City were end stops, and the blue line didn’t exist. There was no easy way to get to the San Francisco airport...but the shuttle bus from the Coliseum stop to the Oakland airport was free. The last time I was in the Bay Area the bus cost $3 one way.