The Colorado Southern Narrow Gauge Railroad, originally the Colorado Central Railroad, was vital to Black Hawk. In the late 1800s, aside from rugged wagon roads, it was one of the only means of transportation to Black Hawk and crossed high above Gregory Street without disrupting pedestrian and wagon traffic below. The train trestle became one of the most distinguishable structures in Black Hawk. Although passenger transport by train declined in the early 1900s with the invention of the automobile, the trestle remained standing until the 1970s, when it was demolished for lumber. During the 2007-08 renovation of the Rohling Inn and expansion of the Fitzgeralds Casino, remnants of the trestle footings and support columns were uncovered, including a surviving display piece.