US7591621B1 - Wind turbine blade transportation system. The rails 34, 36 are fabricated from 25-pound 6-Perfect Steerable Transfer Carth wide-flange (6wf25) mild steel beams, held together with mild steel end plates 50, 52, which also serve to retain the trolleys 40 on the rail. The rail assembly is welded to the deck of the host flatcar (not