After splitting off to the east from the Union Tool Company plant which was once a short distance south of the bridge , the line ended at a Columbia Steel steel mill ( later United States Steel ) by running up and over the east\/west Torrance local line . It is the only part of the PE which crossed itself this way . After splitting off to the east from the Union Tool Company plant which was once a short distance south of the bridge , the line terminated at a Columbia Steel steel mill ( later United States Steel ) by running up and over that railroad 's east\/west Torrance local line in much the same manner as a viaduct and is the only part of the PE which crossed itself in such a manner ; indeed , the map on the following reference link refers to the bridge as a viaduct .