Much of the transit infrastructure was torn down and replaced with roads. The bay area had a great rail system, but it was removed. The Key System is one notab

Much of the transit infrastructure was torn down and replaced with roads. The bay area had a great rail system, but it was removed. The Key System is one notable example: https://en.wikipedia.org/wiki/Key_System https://en.wikipedia.org/wiki/Key_System The new Bay Bridge span was specifically not designed to carry rail, so rail over the bridge is not coming back.