Airport Boulevard Railway Underpass - South San Francisco CA The Public Works Administration (PWA) paid for a grade-separation underpass on the Bayshore Highway under the Southern Pacific Railroad tracks in South San Francisco. The project cost $200,000.
The underpass, completed in 1936, doubled the width of an earlier structure built in 1927 and increased its capacity from 4 to 8 lanes (lanes were narrower at the time). This was much desired by the local Chamber of Commerce and, no doubt, by travelers on the Bayshore Highway, the main route south from San Francisco to San Jose. It also improved access to the San Francisco Airport, which was benefitting from New Deal...