Under Slung Overhead Travelling Crane Dotrum Underslung Cranes (also referred to as Underhung or Under-running cranes) are suitable for factories, aerospace or warehouses as they do not obstruct or take up floor space. They can be either Single-Girder or Double-Girder, and are typically more suited for limited space with lighter capacities - typically a maximum of 10 ton. As both ends of the girder are mounted onto the bottom of the end carriages in an 'Up-side' position, this design eliminates the need for vertical columns to support the runway. Due to this, the Underslung Crane can ensure a more spacious floor space. Without a doubt, Dotrum Underslung Cranes are considered an essential method to enhance the maximum usage of the limited space available.