On a single girder crane, the bridge consists of one girder beam supported on each side by an end truck. The trolley and hoist are most commonly under slung—meaning they run on the boom flange of the bridge. The bridge itself can either be top running or under running in design. One of the most common misconcepons about single girder cranes is that they are not as durable or of the same high quality as double girder cranes. If properly designed, a single girder crane can be the perfect soluon for a business that needs a light to medium duty crane, or for a facility where headroom and/or floor space is limited.