Rubber Tyre Container Gantry Crane, Double Girder Crane

 The RTG(DRA Container Rubber Tyre Gantey Crane) is a mobile device used to move and stack storage containers. Similar to the traditional Gantry crane, which operates on a railway system, the rubber tyred Gantry crane is commonly found in stockyards and other locations where box-shaped storage containers are used. In the U.S., the term is spelled rubber-tired Gantry crane.

A traditional Gantry crane is a fixed device that straddles a railway or roadway. The crane lowers a cable which is attached to hook-up points on a storage container. The container is then lifted by the crane and either moved to the stack of other inter modal containers or loaded onto rail cars or flatbed trailers for shipping.
The RTG crane works on the same principle with the exception that the complete rig is mobile from one location to another and the crane that sits atop the rig is mobile, as well. This type of mobile gantry crane is useful in cases of emergency response or for temporary container storage yards. Due to the mobility of the rubber tyred Gantry crane, it can be moved to a remote location and used to load or unload inter modalshipping containers.

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