Durango and Silverton Narrow Gauge Railroad, Heritage railway in Southwest Colorado Mountains, United States.

The Durango and Silverton Narrow Gauge Railroad is a 3 ft (914 mm) narrow-gauge heritage railway running 45.2 miles between Durango and Silverton, Colorado. Its line climbs through the narrow Animas Canyon, where workers blasted a level shelf into steep granite walls to lay the track. A black steam locomotive with a tall smokestack and rectangular side tank lettered "DURANGO & SILVERTON" and numbered 476 pulls yellow passenger cars with black roofs and rows of rectangular windows.

The Denver & Rio Grande reached Durango in July 1881 and built the final 45 miles to Silverton in nine months and five days, mostly with Chinese and Irish laborers paid $2.25 a day; the line opened on July 10, 1882. After the Panic of 1893 and the end of free silver coinage, mining revenue fell. In 1947 the railroad launched The Silverton, a summer-only passenger train, and a locomotive and four coaches were repainted yellow as "The Painted Train". The Interstate Commerce Commission refused an abandonment petition in the 1960s, and in 1981 the D&RGW sold the line to Charles E. Bradshaw Jr.

The line's name comes from the two towns it links, and its trains have run since 1881. In 1947 the railroad launched a summer-only service called The Silverton and painted a locomotive and four coaches in a yellow scheme, nicknamed "The Painted Train". The yellow passenger cars seen today continue that paint scheme.

The round trip takes about seven hours, with a layover of several hours at the endpoint where visitors can walk through the small town. In winter the trains run on a shorter route, while summer offers multiple daily departures with open cars that work best in good weather.

The line has appeared in 18 films, among them Denver and Rio Grande (1952), shot along the route after World War II and credited with boosting tourist ridership. The Durango roundhouse burned in 1989, damaging every locomotive; it was rebuilt in 1990 using bricks from the original 1881 structure.