Dumbarton Bridge Road and Rail, looking east
You can see the train trestle towards south (to the right) of the highway span. (A bridge of the Hetch Hetchy Aquaduct crosses the Bay between them.)
The elevated rails and trestle of the old railroad line
Southern Pacific’s Dumbarton Cutoff train bridge.
The cutoff was the first bridge across the Bay. It carried freight trains from 1910 to 1982. The swing span allowed boat traffic to pass through. Now it is permanently welded open. The bridge is currently closed, and its ends are fenced off, but it may someday carry commuter rail traffic.