Each tunnel has parallel wooden stringers which are bolted to the floor, and are intended to support steel rails that were never laid. They are from center to center, which is 2.5 inches wider than most railway lines. All curves in the tunnel are gradual, and on those curves the outside stringer was raised higher than the inner stringer to accommodate trains traveling at speeds of more than . There were many details of the unfinished subway system, such as a provision for a station at Mohawk Corner, where the wall has been set back. At Walnut Street the lines begin to curve south to go into downtown, but they are stopped short by a bricked-up wall. The subway tunnel is double-tracked throughout its entire length, with a concrete wall separating the two tracks. Openings in the wall enable persons to step from one track to another. The tunnels are well ventilated and provide much light until Liberty Street is reached. See also List of rapid transit systems Riverfront Transit Center, a largely unused transportation center in Cincinnati MetroMoves, a never built light rail system in Cincinnati Streetcars in Cincinnati Cincinnati Bell Connector, the operational streetcar system in Cincinnati, Ohio Footnotes References Further reading "America’s largest abandoned subway is in Cincinnati – and most locals are unaware of It", TheVintageNews.com July 5, 2016 External links City of Cincinnati - The Cincinnati Subway Images: Cincinnati Subway and Street Improvements, 1916-1955 digital collection. Includes over 9,000 photographs and map. Queen City Discovery: Subway 2010 Current photographs of the stations. The Cincinnati Subway Additional current photographs of the stations. UrbanAdventure.org's tour of the subway in 2002 Studies: MetroCincinnati A 2010 vision for rapid transit in the Greater Cincinnati and Northern Kentucky region. Cincinnati Subway Revival Study A 2008 study by URS Corporation shows that light rail could be implemented in the original tunnels. Rapid transit in Ohio Passenger rail transportation in Cincinnati Underground rapid transit in the United States Abandoned rapid transit stations Cancelled rapid transit lines and systems Cancelled projects in the United States Urban exploration