That's the Dumbarton Rail Bridge, built in 1910 and closed in 1982. The western trestle burned down in the 90s [1] and the swinging part of the span has been we

That's the Dumbarton Rail Bridge, built in 1910 and closed in 1982. The western trestle burned down in the 90s [1] and the swinging part of the span has been welded into a perma-open position. Several studies were done in the 90s and 2000s to restart rail service, including this 2004 one from the San Mateo County Transportation Authority [2]. The bridge itself would have to be significantly refurbished, replacing the movable span and various segments. [1] http://www.sfgate.com/news/article/Mysterious-Fire-On-Trestle-Probed-Rail-bridge-3016220.php http://www.sfgate.com/news/article/Mysterious-Fire-On-Trestl... [2] https://web.archive.org/web/20160318141356/http://www.smcta.com/Assets/Dumbarton+Rail+Corridor/documentation/DRC_PSR_Summary.pdf https://web.archive.org/web/20160318141356/http://www.smcta....