The mast is build from welded steel sheet. It is fixed to bottom and top carriage with bolted flange connections. It acts as a guide for the lifting platform and supports many sub-assemblies of the crane, e.g.: the electrical cabinet, the hoistmechanism, ladders, platforms and the guide/catch rail. A top-carrier with bogies riding in the switch mode is fixed to the upper section of the mast. These bogies ensure that the rackstacker follows the upper rail.