Durango and Silverton Narrow Gauge Railroad
The Durango and Silverton Narrow Gauge Railroad, often abbreviated as the D&amp;SNG, is a 3 ft (914 mm) narrow-gauge heritage railroad that operates on of track between Durango and Silverton, in the U.S. state of Colorado. The railway is a federally-designated National Historic Landmark and was also designated by the American Society of Civil Engineers as a National Historic Civil Engineering Landmark in 1968.