Top Running Singler Girder Cranes consists of a single girder mounted on top of two end trucks that span the width of a building and have a hoist running on the lower flange of a structural shapes girder. These cranes normally have capacities up to 20 tons and spans up to 60 feet. These are normally operated from the floor by a pendant station that travels with the hoist across the span of the structural shape girder. The single-girder, top-running crane is very economical for light to moderate service.