The Cincinnati Southern Bridge, officially the Cincinnati Southern Railroad Swinging Truss Bridge, is a Railroad Truss Swing Bridge that carries the Norfolk Southern Railway over the Ohio River between Cincinnati, Ohio, and Ludlow, Kentucky. The bridge is composed of 4 truss spans: A main span on the northern side of the bridge, a currently unused swing span on the southern side, and 2 additional spans over the main shipping channels in the center of the bridge.