String transport system, comprising a track structure having a lower level and an upper level, and comprising two rail cords of the lower level of the track structure and above them two rail cords of the upper level of the track structure, wherein the rail cords of the lower level are mounted on a foundation between anchor supports and resting on intermediate supports, wherein the rail cords (3, 4) are made in the form of prestressed load-bearing members enclosed in corresponding bodies with mating therewith rolling surfaces for wheeled vehicles and wherein the rail cords (3, 4) form two tracks, interconnected in spans G between adjacent supports (2a, 2b) by means of two-level trussed track structure in the form of zigzag-oriented rod elements, wherein said zigzag-oriented rod elements form triangles with rail cords (3, 4) of the lower and upper levels and are positioned on the outer sides of those rail cords (3, 4), wherein at each level of the track structure, left and right rail cords (3 L, 3 P, 4 L, 4 P) are connected to each other by cross bulkheads installed in junction units of rod elements and rail cords (3, 4), characterized by that the rail cords of lower level are fastened on transverse beams between vertical longitudinal planes A and B, passing through junction units of said zigzag-oriented rod elements, wherein the transverse beams are connected to supports (2a, 2b) by means of assembly units, located in two vertical longitudinal planes N and M with the possibility of displacement along the track structure, whereas the transverse beams are arranged at points of sections by corresponding latitudinal planes W passing through junction units and centers of supports (2a, 2b), while vertical longitudinal planes A and B, containing junction units are displaced relative to assembly units of transverse beam, towards its center by distance L defined by the ratio: 0.02 ≤ L / H ≤ 0.5, where H - the height of the trussed track structure, whereby the length S of cross bulkhead, and the length K of transverse beam between assembly units thereof, are related by the ratio: 0.5 ≤ S / K ≤ 0.95, whereby the length of spans G is made multiple of the distance R between junction units of rod elements and rail cords of lower level of trussed track structure. wherein the rail cords of the lower level are mounted on a foundation between anchor supports and resting on intermediate supports, wherein the rail cords (3, 4) are made in the form of prestressed load-bearing members enclosed in corresponding bodies with mating therewith rolling surfaces for wheeled vehicles and wherein the rail cords (3, 4) form two tracks, interconnected in spans G between adjacent supports (2a, 2b) by means of two-level trussed track structure in the form of zigzag-oriented rod elements, wherein said zigzag-oriented rod elements form triangles with rail cords (3, 4) of the lower and upper levels and are positioned on the outer sides of those rail cords (3, 4), wherein at each level of the track structure, left and right rail cords (3 L, 3 P, 4 L, 4 P) are connected to each other by cross bulkheads installed in junction units of rod elements and rail cords (3, 4), characterized by that the rail cords of lower level are fastened on transverse beams between vertical longitudinal planes A and B, passing through junction units of said zigzag-oriented rod elements, wherein the transverse beams are connected to supports (2a, 2b) by means of assembly units, located in two vertical longitudinal planes N and M with the possibility of displacement along the track structure, whereas the transverse beams are arranged at points of sections by corresponding latitudinal planes W passing through junction units and centers of supports (2a, 2b), while vertical longitudinal planes A and B, containing junction units are displaced relative to assembly units of transverse beam, towards its center by distance L defined by the ratio: 0.02 ≤ L / H ≤ 0.5, where H - the height of the trussed track structure, whereby the length S of cross bulkhead, and the length K of transverse beam between assembly units thereof, are related by the ratio: 0.5 ≤ S / K ≤ 0.95, whereby the length of spans G is made multiple of the distance R between junction units of rod elements and rail cords of lower level of trussed track structure.