The tongue rail (3) via its end (6) is firmly connected to the end (7) of the connecting rail by at least one screw union (8). A tongue rail union (5) is so formed that the tongue rail end (6) after release of the connection can be moved away without raising the tongue rail from the connecting rail end. The tongue rail union (5) is provided in the area of the connection between the tongue rail end and the connecting rail end. The connecting rail end has an angled Z or L-shaped cross-section and a horizonal arm together with a vertical arm. The tongue rail end with its underside locates on the upper side of the horizonal arm and with its inner side facing the shoe rail (2) on the outside of the vertical arm.
