A guide rail system for guiding containers moved by a conveyor defining a path with a curved segment. The guide rail system includes a number of contact portions, for engaging the containers, to at least partially locate the containers in preselected positions on the conveyor, and a number of adjustable point devices, for locating the contact portions in predetermined locations respectively relative to the conveyor. Each adjustable point device includes an adjustment element on which one or more of the contact portions is mounted. The system also includes a drive element connected to the adjustable point devices to locate the adjustment elements, including a flexible shaft substantially aligned with the curved segment, which is connected with selected ones of the adjustable point devices are spaced apart from each other along the curved segment.