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San Francisco, California
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When it opened in 1918, the Twin Peaks Tunnel stretched 2.27 miles, making it the longest streetcar tunnel globally at the time.
The tunnel features two stations: Forest Hill and West Portal, both serving as key transit points in the city's Muni Metro system.
Constructed through the rugged terrain of the Twin Peaks, the tunnel was a significant achievement in early 20th-century engineering.
The Twin Peaks Tunnel played a crucial role in expanding San Francisco's streetcar system, facilitating the development of residential neighborhoods in the western part of the city.
In 2018, the Twin Peaks Tunnel underwent a major renovation to improve safety and reliability, including seismic upgrades and track replacements.
The construction of the Twin Peaks Tunnel significantly contributed to the growth of neighborhoods like West Portal and Forest Hill, making them more accessible to downtown San Francisco.
