Transport element system, formed from a transport element which consists of a polygonal profiled part, on one longitudinal side surface of which is arranged a mostly rigid belt, and a trolley, the belt and trolley engaging in one another such that the trolley is guided and moves inside the transport element and is movable outside the transport element with a connection element adapted in each case for connection and control of applications, and the transport element is made up of hollow profiled parts that have a linear form (2.3) and a bent form (2.4), the profiled parts being equipped, in a respective profiled surface, with a guide opening (2.7) which runs continuously along the running direction, a transport belt (2.9) as well as a parallel busbar (2.10) being arranged in the profiled parts on an inner surface (2.8) opposite to the guide opening (2.7), the transport belt and busbar continuously running correspondingly to the form of the profiled parts, characterized in that in the transport element, the transport belt (2.9) has symmetrical receiving openings (2.1) in which a linear toothed chain drive is to be moved that has a toothed chain (1.1) that is toothed and flexible on both sides, the chain combining tooth flanks of an involute gearing on the output side and tooth flanks of a serration gearing on the drive side, and output-side tooth flanks of which engaging and rolling in the symmetrical receiving openings (2.1), the toothed chain drive is to be moved in the transport element, the transport belt (2.9) is mounted against slipping in a support (2.11) and in addition to the hollow profiled parts has in linear and curved form (2.3 and 2.4) also in opposite torsional form (2.5 and 2.6), characterized in that the trolley consists of a cover surface (3.1) with vertically deflected legs (3.2, 3.3) on both sides, the outer surface of which having an adapted connection element for coupling to the respective application and a separating wall (3.4) that is vertical, centered and t-shaped on one side being arranged thereon, holders (3.4.1, 3.4.2, 3.4.3, 3.4.4, 3.4.5, 3.4.6) having opposite rollers (3.5) arranged on both sides that are held and guided on the separating wall (3.4) opposite in the vertical and horizontal direction and characterized in that after introducing the trolley into the transport element, the cover surface (3.1) with the legs (3.2, 3.3) and the adapted connection element of the trolley protrudes out above the transport element, the separating wall (3.4) protrudes into the guide opening (2.7) of the transport elements arranged vertical to the running direction and at the end is movably guided on the inside surface (2.8) between the support (2.11) with the transport belt (2.9) and the busbar (2.10) by the rollers (3.5). characterized in that in the transport element, the transport belt (2.9) has symmetrical receiving openings (2.1) in which a linear toothed chain drive is to be moved that has a toothed chain (1.1) that is toothed and flexible on both sides, the chain combining tooth flanks of an involute gearing on the output side and tooth flanks of a serration gearing on the drive side, and output-side tooth flanks of which engaging and rolling in the symmetrical receiving openings (2.1), the toothed chain drive is to be moved in the transport element, the transport belt (2.9) is mounted against slipping in a support (2.11) and in addition to the hollow profiled parts has in linear and curved form (2.3 and 2.4) also in opposite torsional form (2.5 and 2.6), characterized in that the trolley consists of a cover surface (3.1) with vertically deflected legs (3.2, 3.3) on both sides, the outer surface of which having an adapted connection element for coupling to the respective application and a separating wall (3.4) that is vertical, centered and t-shaped on one side being arranged thereon, holders (3.4.1, 3.4.2, 3.4.3, 3.4.4, 3.4.5, 3.4.6) having opposite rollers (3.5) arranged on both sides that are held and guided on the separating wall (3.4) opposite in the vertical and horizontal direction and characterized in that after introducing the trolley into the transport element, the cover surface (3.1) with the legs (3.2, 3.3) and the adapted connection element of the trolley protrudes out above the transport element, the separating wall (3.4) protrudes into the guide opening (2.7) of the transport elements arranged vertical to the running direction and at the end is movably guided on the inside surface (2.8) between the support (2.11) with the transport belt (2.9) and the busbar (2.10) by the rollers (3.5).