Weird & curiousHistoric
Twin Peaks Tunnel
The Twin Peaks Tunnel is a 2.27-mile-long (3.65 km) light rail/streetcar tunnel in San Francisco, California. The tunnel runs under Twin Peaks and is used by the K Ingleside, L Taraval, M Ocean View and S Shuttle lines of the Muni Metro system.
The eastern entrance to the tunnel is located at the west end of the Market Street subway, near the intersection of Market and Castro Streets, in the Castro neighborhood, and the western entrance is located at West Portal Avenue and Ulloa Street, in the West Portal neighborhood, named for the tunnel.
Why it's on the map
Plans for a tunnel extending from Market Street under Twin Peaks were first presented at the Merchants' Association banquet in May 1909.
Trolley Festival service gradually expanded from being summer-only and five days a week to running May to October and daily for part of the year, and all streetcars on that service reached Market Street from Muni's Metro Rail Center via the Twin Peaks Tunnel and the 1972 portals.
In July 1910, an architectural rendering was released of the eastern portal; the tunnel was initially envisioned as a two-story bore 1.5 miles (2.4 km) long, carrying road traffic on the upper deck and rail traffic on the lower deck.
However, the surface tracks – and the 1972-built Castro portals – came back into use the following summer for the first Historic Trolley Festival, in 1983.
Source: Wikipedia / Wikidata
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