Abstract: A trolley for traveling along a beam supported from below and having two protruding flanges comprising a frame that partially surrounds the beam, a travel wheel mounted so that it contacts and rolls on an upper surface of the lower flange of the beam, a second wheel mounted within the frame for gliding the trolley along one of the upper surface of the lower flange or a lower surface of the upper flange and a guide roller mounted within the frame for guiding the trolley along the beam.

Abstract: Rails supporting vehicles are suspended under utilization of a mounting plate being laterally adjustable by means of a detent structure and oblong slots secured to a lowermost portion of support tower or the like and having four bores threadedly receiving four suspension bolts for a C-shaped bracket member having an uppermost suspension plate with arc-shaped bores for receiving the suspension bolts; a plurality of nuts threadedly secure the suspension plate to the suspension bolts from above and from below in an elevationally adjustable manner; the rail is secured to the lower portion of the bracket member.