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	For shipbuilding and heavy precast concrete casting yards, massive gantry cranes can now have random radius travel as well as VIRTUAL rail travel capability. The gantry cranes can travel both straight and sideways as well as rotate on-center. In VIRTUAL rail operation, the crane will travel with INERTIAL GUIDANCE using tiny magnets cemented into the concrete operating surface. These trackless gantry cranes can handle ANY number of parallel assembly lines.