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Under the roadway are 60-foot-wide (18 m) transverse steel girders, which were built in several pieces and riveted together; [12] each girder is 5 feet (1.5 m) deep. [14] The main span above 125th Street is supported by two plate girders measuring 130 by 10 by 8 feet (39.6 by 3.0 by 2.4 m) across, [ 14 ] which were described as the world's ...