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| Last updated on August 8, 2025
A Denver & Salt Lake passenger train pauses at Arrow, Colo., on the original Rollins Pass line in 1905. At left is the main line west to Middle Park, which has a 4-percent grade. Today, Union Pacific freights and Amtrak’s California Zephyr bypass this treacherous trackage with Moffat Tunnel, completed in 1928.
L. C. McClure photo
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Thanks to the constantly evolving and modernizing rail network, “treacherous tracks” on American soil have become friendly lines…
Dr. Güntürk Üstün