Applies to stevedoring operations involving containerized cargo. Applies to ships designed for freight carrying containers. Contemplates loading or unloading, stowing, shifting or trimming of cargo, transfer of cargo, supplies and material between vessels , transfer between string piece and point of deposit on dock and adjacent warehouses including tiering, sorting and breaking down, and operation of all mechanical equipment in connection with the above. Also contemplates the use of gantry cranes Includes employees engaged in the storage, maintenance or repair of nets, slings, forklift trucks or other equipment utilized by stevedoring concerns.