Looping in Colorado By Angela Cotey | January 14, 2012 | Last updated on December 22, 2020 Get our weekly newsletter delivered to your inbox Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Colorado & Southern narrow gauge 2-8-0s Nos. 70 and 73 cross the high bridge on the Georgetown Loop with seven cars. The engines are moving at only 5 mph due to the frail nature of the bridge on May 14, 1938. Photo by R. H. Kindig Share this article Print Facebook