Durango & Silverton Railroad

The Durango & Silverton Narrow Gauge Railroad Company, often abbreviated as the D&SNG, is a 3 ft (914 mm) narrow-gauge heritage railroad that operates on 45.2 miles (72.7 km) 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. The line from Durango to Silverton has run continuously since 1881, although it is now a tourist and heritage line hauling passengers, and is one of the few places in the US which has seen continuous use of steam locomotives.