Abstract: A device in the storage system having movable units placed one beside the other and provided with shelves, the units being movable sidewise on tracks in order to form a passage between two units movable in opposite directions, the passage allowing access to the units, and a handling device movable into said passage for loading or unloading of articles into and out of the units. The tracks carrying the movable units are composed of interspaced sections placed on the floor which are provided with upwardedly directed support wheels or rollers, and that in the interspaces uninterrupted rails extend therein upon which said handling devices are movable.