The goliath crane move on rails supported on floor level instead of rails placed at elevated level as in case of EOT Cranes.
A Semi Gantry Crane is a variation of a Gantry crane in which one end carriage of the crane travels on the regular gantry rail while the opposite end-carriage will travel on a rail mounted typically on the ground or at a lower elevation. A semi Gantry crane is used in applications such as a tool room where part utilization of the bay is required, or in outdoor sites where a gantry rail can be installed on the side of an existing structure.