Smoke rises from Engine No. 300 of a Denver Northwestern & Pacific Railroad train as it passes through a tunnel in Colorado. Railroad trestle tracks are in the canyon below the tunnel. Tree, boulders and small rocks dot the hilly landscape.
Denver, Northwestern and Pacific Railway--1900-1910.; Railroad locomotives--Colorado--1900-1910.; Railroads--Colorado--1900-1910.; Tunnels--Colorado--1900-1910.
[between 1900 and 1910]
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