An automated handling line guide rail assembly. The automated handling line guide rail assembly comprises a guide rail that defines the perimeter of a path of a container when conveyed along part of an automated handling line. The path and hence the perimeter are arcuate about a center and positioned at a radius from the center. The guide rail is movable radially to define the perimeter at a plurality of different radii from substantially the same center and the guide rail comprises at least three segments. The first segment is driveable in a substantially radial direction; the second segment is connected to the first segment by a link and the third segment is connected to the second segment by a link such that the second and third segments follow movement of the first segment. The first and second segments and the second and third segments are arranged in superposition to overlap and are provided with a slideable link between overlapping portions to allow relative circumferential movement between the first and second segments and the second and third segments as the segments move radially inwardly and outwardly.