Rail fastening system (1) for fastening a rail (2) to a rail subsurface, preferably for a ballastless track, comprising a base plate (10), preferably made of a plastic, and at least one dowel (20), wherein the base plate (10) has at least one opening (15), which completely penetrates the base plate (10) in the thickness direction, and the dowel (20) is introduced into the opening (15), is held therein by means of a retaining contour and projects in the thickness direction at least on one side beyond the base plate (10).