The invention relates to a rail fixing, for securing a rail (10), the bottom flange of which is supported on a concrete sleeper (16), comprising at least one elastic tensioning clamp (20) with several ears, of which at least one ear extends within a collar (42, 44) or channel of a retainer (24), connected to the concrete sleeper and at least one further ear rests on the bottom flange of the rail.According to the invention, a securing of the rail with constructively simple means and saving of space with regard to the dimensions necessary may be achieved, whereby the retainer (24, 26) is detachably arranged in the concrete sleeper (16), or in a plate element supported thereon and connected to the concrete sleeper by means of a screw element.