At one time, it seemed as though every canyon and pass leading into Colorado's high country was a path laid of 3-foot gauge narrow gauge railroad. Dreams of tapping the riches of mining discoveries in mountain locations made this statement almost true. But mining can be a fleeting adventure, and as the state matured, so too did the railroads that crisscrossed it. Many railways succumbed to disappearing tonnage, becoming trackless trails among the...