It is nothing short of amazing that in an era when a computer would have been something of a Sci-Fi novel, surveyors scouted along what is now the grade of the Moffat Tunnel on the edge of the Colorado Rockies and said "sure, we can build a railroad there"! Like tens of thousands of trains before it, the westbound Zephyr passes over fills and through a cut on the approach to Tunnel 3.
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