Rubber Tyred Gantry Crane (RTG Crane) is a mobile gantry crane used in intermodal operations to ground or stack containers. RTG Crane is flexibly moved by its own rubber tyres for transferring containers. RTG Crane is consisted of gantry frame, main girder, legs, slide sill, lifting mechanism, traveling mechanism and electrical box. RTG Crane has proper safety instructions and overload protection devices to ensure the safety of operator and equipment. Electrical system uses PLC frequency adjustment which can easily control every mechanism.