a preferred embodiment of the present invention is described in detail with reference to the drawing wherein fig1 is a cross section of a large slab filled section rail and fig2 shows a large view of the overlapping arrangement between the slab and ballast element fig1 shows a slab 1 of reinforced concrete that is known per se is arranged in a u shaped bedding or ballast element 2 the ballast element 2 is disposed over embedding asphalt 8 an elastic mortar 9 is injected between the ballast element 2 and the slab 1 the mortar is suitably a polymer modified bitumen the slab 1 is suitably provided with injection bores 10 for receiving the injected material and increasing the efficiency of the injection procedure a compact asphalt layer 11 is disposed below the embedding asphalt layer 8 to assure proper support an adhesion preventing 4 is attached to the surface of the ballast element 2 the slabs 1 are displaced in an overlapping relationship over the ballast elements 2 so that the mid point of the length of each slab is aligned with one of the two ends of a ballast element the other end of the same ballast element is aligned with the mid point in the length of another slab a prefabricated reinforced concrete centerpiece 6 that is known per se is disposed between the railway beds with two tracks the centerpiece 6 is supported by lateral ribs formed in the ballast element 2 an absorption system for water drainage and current conductors and can be located below the center piece 6 the ballast element 2 and the new railway bed element of reduced dimensions can be statically dimensioned and made of ductile steel reinforced concrete fixation of the rail is performed in.