Sleeper for a track superstructure

A sleeper for a track superstructure, which is manufactured in one piece from a plastic material, wherein the sleeper has an elongated base shape with two end sections, which are connected by a middle section of the sleeper and are held at a distance and at their upper side in each case one contact surface is provided for in each case one rail to be supported on the respective end section, wherein a reinforcement extending in the longitudinal direction of the sleeper is embedded into the middle section, wherein the reinforcement extends over the length of the middle section, wherein the reinforcement is in each case anchored in an inner edge region of each of the end sections, wherein the inner edge region is located adjacent to the middle section, wherein the reinforcement is wholly or partially arranged in the upper quarter of the height of the sleeper, and wherein the reinforcement is anchored in the manner of a continuous loop with two longitudinal sections and two narrow sections of which in each case one extends between the ends of the longitudinal sections assigned to one another and is anchored in one of the inner edge regions of the end sections the middle section comprises two webs arranged spaced in the width direction and one of the longitudinal sections is embedded in one web, the other longitudinal section is embedded in the other web of the middle section and the two narrow sections are in each case embedded in the inner edge region of the end sections.