Notes on the Geography of The Western United States: The Central Pacific Railroad: Photo 17
The date on this tunnel--the Clark Tunnel, through Boulder Ridge--indicates construction during the reign of E.H. Harriman, who briefly controlled the Southern Pacific as well as the Union Pacific and who invested huge sums in upgrading his properties, including double-tracking the Central Pacific. At many points, like this one, the second track diverges from the first in search of a better gradient.
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