In a railway rail fastening clip 1 for fastening a railway rail to an underlying rail foundation, which clip 1 is formed of an elongate plate shaped such that a central region 11 of the plate has in profile the form of a letter C, a first end region of the plate extending from one side of the central region 11 of the plate to form a substantially planar base portion 12 of the clip for engaging a rail fastening anchoring device secured to the rail foundation and a second end region of the plate extending from the opposite side of the central region 11 of the plate to form a toe portion 13 of the clip for bearing on a foot of the railway rail, such that in profile the second end region extends further than the first end region, the toe portion of the clip is provided with a throughhole 14 which is arranged such that, when the clip is in its operative configuration, part or all of the throughhole 14 lies above the foot of the rail, the throughhole being configured to receive a corresponding spigot 25 of a toe insulator 2 for electrically insulating the clip from the rail whereby the insulator can be retained on the toe portion of the clip.