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Rubber tyred gantry crane
A rubber tyred gantry crane (RTG crane) (also transtainer) is a mobile gantry crane used for stacking intermodal containers within the stacking areas of a container terminal. RTGs are used at container terminals and container storage yards to straddle multiple lanes of rail/road and container storage, or when maximum storage density in the container stack is desired.
A normal container crane runs on steel rails, instead of rubber-tyres. The side-view appearance of a RTG and a straddle carrier are fairly similar, but the top of a RTG also features a movable crane.
Different kind of RTGs