The Hetch Hetchy Railroad (HHRR) was a 68-mile (109 km) standard gauge Class III railroad constructed by the City of San Francisco to support the construction and expansion of the O'Shaughnessy Dam across Hetch Hetchy Valley. Based in Groveland, the HHRR operated from 1917 to 1949.
The Hetch Hetchy Railroad (HHRR) was a 68-mile (109 km) standard gauge Class III railroad constructed by the City of San Francisco to support the construction and expansion of the O'Shaughnessy Dam across Hetch Hetchy Valley. Based in Groveland, the HHRR operated from 1917 to 1949.
Source: Wikipedia "Hetch Hetchy Railroad" · CC BY-SA 4.0
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