Profile: The Liberty Company is a supplier of aluminum bridge, catwalk or gangway structures. We also offer prefabricated pedestrian catwalk, pipe support bridge, trail bridges and overpass structures. Our railings are constructed with T6061 aluminum extrusions designed to AASHTO specifications, and come available in 42" and 54" standard rail heights. The heavy duty, marine grade aluminum frames are used from public boating access ramps, to large commercial marinas.