Dumbarton Train Bridge

Last Friday, we drove across the Dumbarton Bridge from Sun’s Menlo Park campus
during heavy traffic. We went slow enough to get some good photos of the
Dumbarton Train Bridge running
parallel to the automobile bridge. According to a history I found:

The Dumbarton Bridge was the first road bridge to span the Bay, and today it connects the built-out Silicon Valley to the real estate of the south-east Bay. The train bridge south of the Dumbarton Bridge was the first rail bridge across the Bay, the Dumbarton cut-off, opening in 1910. Service stopped in 1982, and the rotating span, which allows boats through, is now welded open. … The old Dumbarton Bridge, which opened in 1927, was replaced by a new bridge built next to it in 1982, and the drawbridge in the middle of the old span was removed.

Driving from Menlo Park to Fremont, it almost looks like the rotating span is
moving (motion parallax). Behind the bridge, look for Hangar One and

Moffet Field on the far shore.