The Colorado Narrow Gauge Railroad refers to a network of narrow-gauge railroads built in Colorado during the late 19th and early 20th centuries. These railroads were primarily constructed to transport minerals and goods from remote mountain areas to larger markets. The narrow gauge, typically 3 feet wide, allowed for easier construction in rugged terrain. One of the most famous lines was the Denver and Rio Grande Western Railroad, which played a crucial role in the state's mining boom. Today, some sections of these historic railroads have been preserved as tourist attractions, offering scenic rides through the picturesque Colorado landscape.