As a result of the need for higher productivity ship-to-shore container cranes, seven concepts are composed that can simultaneously transfer 4 Twenty Foot Equivalent Unit containers. All concept can be built on a standard ship-to-shore crane structure. These concepts are based on working principles found in (patent) literature. The concepts are compared based on multiple objectives, after which one concept is chosen to realize a concept design. A ship-to-shore crane with two trolleys turns out to be the most suitable concept. The two trolleys consist of a rope towed trolley and a semi rope trolley, which are combined with a continuous rope support system. The design of the trolleys is based on an existing trolley. For all wire ropes to run adjacently, the sheave diameters and positions on both trolleys deviate from the existing trolley. The sheave positions have consequences for the trolley frame design. To validate the adjusted trolley frames, a finite element analysis is performed.