A transtainer is a large gantry crane, sometimes called an RTG, used to load, unload, or stack containers.
Gantry cranes consist of parallel frame bars with cross-bars that hold the crane mechanism over the container stacks. Transtainers may be used on rails or pneumatic tires. When on rails, the transtainer can only operate directly above the rails. On tires, it has a broader field of movement and may be called an RTG, which is short for rubber-tyred gantry crane.
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