Weird & curious
Fillmore Street Tunnel
The Fillmore Street Tunnel was a proposed double-bore tunnel approximately 3⁄4 mile (1.2 km) long in San Francisco, California which would have carried Fillmore Street and a new streetcar line underneath Pacific Heights. The proposed tunnel would have connected the Western Addition and Fillmore Districts, near the south portal at Sutter Street, with Marina and Cow Hollow, near the north portal at Filbert Street. One tunnel would have been reserved for railroad and pedestrian traffic, while the parallel tunnel would have been for vehicles.
Why it's on the map
The tunnel was planned, along with the contemporary Twin Peaks and Stockton Street Tunnels, to serve the traffic that was anticipated from the 1914–15 Panama–Pacific International Exposition.
By February, the Fillmore alignment was being favored over competing parallel routes along Steiner, Pierce, and Divisadero; however, the land and tunnels committee of the San Francisco Board of Supervisors delayed their official endorsement of the Fillmore Street Tunnel proposal while awaiting the results of consultant Bion J. Arnold's study; Arnold declared his support in March 1912 via telegram.
Source: Wikipedia / Wikidata
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