Rail-mounted gantry cranes (RMG) are specialized yard container handling machines. Rail Mounted Double Girder Container Gantry Crane is suitable for loading and unloading of large span, frequently railway freight yard, port, open storage, container transfer station etc.. This machine adopts U type gantry, its legs headroom large (nearly 7 meters). It is suitable for heavy bulky cargo and container handling operations, with frequent high-level work, A5 ~ A8. The weight of 5 to 500 tons, the span of 18 to 35 meters, the girder can be designed have cantilever and no cantilever, the end of two main beam connected with end beams to meet the high level requirements. lt is supported on the track by several sets of steel wheels.powered by utility electricity, and consists of large vehicle mechanism, small vehicle assembly,gantry,power system, and special spreader for containers.