This is a list of narrow-gauge railways in the United States. Narrow-gauge railroads of various sizes existed across the US, especially during the late 1800s, with the most popular gauge being gauge. Some of the more famous gauge railroad networks in the US were based in California, Colorado, and Hawaii. These narrow-gauge lines were easier to build than standard gauge and cost significantly less to construct. Some of the lines of these former networks still exist in the present day and continue to use gauge track, while the rest were either widened to standard gauge or abandoned (see table below). Railroads See also Narrow-gauge railroads in the United States Heritage railway 2 ft gauge railroads in the United States 2 ft 6 in gauge railroads in the United States 3 ft gauge railways in the United Kingdom Three foot six inch gauge railways in the United States Three foot gauge locomotives on the U.S. National Register of Historic Places Rio Grande 168 (operational) Rio Grande 169 (static display) Rio Grande 223 (stored) Rio Grande 278 (static display) Rio Grande 315 (operational) Rio Grande 463 (operational) ET&WNC No. 12 (operational) Eureka Locomotive (operational) Glenbrook Locomotive (operational) References Bibliography