Abstract: A stock rail fastening for switches of railway track installations in which a slide chair and spring U-clip fix one flange of a stock rail to a baseplate, and a clamp fixes the other flange of the stock rail to the baseplate. The slide chair has one side overhanging the one flange and is spaced apart from the base plate to provide a recess therebetween. The spring U-clip is within the recess under bending tension and has a loop portion bearing against the one flange, and a pair of arms extending from the loop portion and having spaced apart ends supported on notches at another side of the slide chair. The entirety of the U-clip is polygonal in cross section, the arms between the loop portion and the ends have a portion which is square in cross section, and the arms each have a side face parallel to a horizontal plane when the U-clip is tension free.