The Southern Pacific Railroad - Railway Wonders of the World

How the 'Sunset Route' Railroad Helped Diversify California - Atlas Obscura

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A monument sign from 1955 showing the Tehachapi Train Loop near News Photo - Getty Images

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Union Pacific Railroad - Wikipedia

7 Wonders of the Railroad World - Mountain Valley Living

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File:Tucson-Southern Pacific Railroad Locomotive No. 1673-1900.JPG - Wikipedia

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Sacramento Locomotive Works – Sacramento, California - Atlas Obscura