A self-contained guide track is formed by first guide tracks and second guide tracks of a rack level and each track section of the closed guide track is determined from an intersection point of one of the first guide tracks with one of the second guide tracks to the next intersection point of one of the first guide tracks with one of the second guide tracks and the at least one rail vehicle is configured to be controlled on the track sections of the closed guide track during storing and removing the items in a main direction in the form of a roundabout such that the track section of the closed guide track, on which more than one rail vehicle is located, is used by the rail vehicles only in the main direction.