The Silverton Railroad, now defunct, was an American 3 ft (914 mm) narrow gauge railroad constructed between Silverton, Colorado and mining districts near Red Mountain Pass, Colorado. The Silverton Railroad is remembered for the innovative solutions to difficult engineering problems presented by the steep, mountainous terrain which were devised by the railroad's chief locating engineer, Charles Wingate Gibbs – the Chattanooga Loop, the depot in a wye at Red Mountain, and a covered turntable on the main track at Corkscrew Gulch – and for the unusual and expensive annual passes presented by the owner, Otto Mears.