Bulging fishtail plate

The middle of the drum Fishplate is provided with a screw hole, along the horizontal axis of the screw hole on both sides are provided with the upper working face in contact with the lower part of the rail head, and the lower working face in contact with the upper part of the rail bottom, the back of the upper working face extends upward to form a transition section higher than the rail surface, the transition section along the length of the fishplate to form a bridge arch with the middle high and both ends low