Map of the Union Pacific Rail Road and surveys of 1864, 65, 66, 67, 1868 from Missouri River to Humboldt Wells, G.M. Dodge, Chief Engineer.

Map of the Union Pacific Rail Road and surveys of 1864, 65, 66, 67, 1868 from Missouri River to Humboldt Wells, G.M. Dodge, Chief Engineer.

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Map of the Union Pacific Rail Road and surveys of 1864, 65, 66, 67, 1868
from Missouri River to Humboldt Wells, G.M. Dodge, Chief Engineer.
Courtesy Library of Congress.

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Also see, History and the Census: The Transcontinental Railroad, by Jason G. Gauthier, May 1, 2023,

and California's role in the first Transcontinental Railroad.