A track superstructure for a railway on a subgrade inclined transversely to the length thereof, comprises a ballast structure of individual ballast stones, and sleepers embedded in the ballast structure, on which rails may be mounted, the ballast structure comprising load dissipation regions beneath the sleepers, the regions receiving loads acting vertically on the ballast structure via the sleepers when a train rides on the rails and transferring these loads to the subgrade below the ballast structure. This transfer is characterized in that substantially only the voids between the ballast stones within the load dissipation regions of the ballast structure are filled with a foam material, especially a PU polyurethane foam material, for fixing the ballast stones in a stable position, and an elastic drain layer is arranged between the ballast structure and the subgrade.