A guide system for guiding a movably-supported first furniture part, in particular a first door wing of a folding door, which is hingedly connected to a second furniture part, in particular a second door wing of a folding door, and with a rail arrangement which includes: - a guide rail having a longitudinal direction for guiding the furniture parts (3a, 3b), - a carrier movably supported, in the mounted position, in a direction transverse to the longitudinal direction of the guide rail, wherein the carrier, in the mounted position, can be moved into a transfer position in which the carrier adjoins the guide rail in the longitudinal direction such that a guiding device of the guide system configured to be connected to one of the furniture parts (3a, 3b) and configured to be movable along the guide rail can be transferred to and from between the guide rail and the carrier, - wherein the guide system includes a column connected to the carrier, the column being arranged vertically in the mounted position and being configured to be moved, jointly with the carrier, in the direction extending transversely to the longitudinal direction of the guide rail, wherein the first furniture part, in the mounted position, is connected to the guiding device and the second furniture part, in the mounted position, is movably connected to the column, characterized in that a drive device with an entrainment member is provided, the entrainment member being acted upon by at least one force storage member and being configured to be releasably coupled to the guiding device, wherein the entrainment member is locked by a locking device in the transfer position of the carrier, and wherein the entrainment member is configured to be unlocked by an entering movement of the guiding device in or on the carrier, so that the entrainment member, together with the guiding device coupled therewith, can be retracted, starting from the transfer position, at least over a region in the direction extending transversely to the longitudinal direction of the guide rail, preferably along a second guide rail, by a force of the at least one force storage member, wherein the carrier, in the transfer position, can be releasably locked with the guide rail by the locking device. - a guide rail having a longitudinal direction for guiding the furniture parts (3a, 3b), - a carrier movably supported, in the mounted position, in a direction transverse to the longitudinal direction of the guide rail, wherein the carrier, in the mounted position, can be moved into a transfer position in which the carrier adjoins the guide rail in the longitudinal direction such that a guiding device of the guide system configured to be connected to one of the furniture parts (3a, 3b) and configured to be movable along the guide rail can be transferred to and from between the guide rail and the carrier, - wherein the guide system includes a column connected to the carrier, the column being arranged vertically in the mounted position and being configured to be moved, jointly with the carrier, in the direction extending transversely to the longitudinal direction of the guide rail, wherein the first furniture part, in the mounted position, is connected to the guiding device and the second furniture part, in the mounted position, is movably connected to the column,