A ceiling track system • including - a guiding rail,. in which at least one wall element is accommodated via a carriage unit, and. which has a latching geometry as well as a groove, and - at least one encasing element, which. is configured to be affixed to the guiding rail, and. is configured as a profile in an L-shape with a long branch, at which one latching hook is disposed, and with a short branch, • wherein - the latching hook is configured to latch in the guiding rail in such a way that the encasing element is affixed to the guiding rail from a unidirectional vertical joining direction in a self-retaining manner, - the long branch extends in the vertical joining direction, - the geometric transition between the long branch of the encasing element and the latching hook has a cross-sectional constriction, - the long branch adjacent the area of the cross-sectional constriction has a web with a projection, and - the projection for self-retaining the encasing element at the guiding rail engages into the groove, characterized in that • the guiding rail, adjacent the groove, has a screw reception, into which a screw element is screwable, • by screwing the screw element clamping the web at the guiding rail is realized, and • the screw reception is configured at an angle (α) with regard to the vertical joining direction, in order to screw the screw element from the direction of a symmetry plane of the guiding rail, wherein the symmetry plane is located at half the width of the guiding rail. • including - a guiding rail,. in which at least one wall element is accommodated via a carriage unit, and. which has a latching geometry as well as a groove, and - at least one encasing element, which. is configured to be affixed to the guiding rail, and. is configured as a profile in an L-shape with a long branch, at which one latching hook is disposed, and with a short branch, - a guiding rail,. in which at least one wall element is accommodated via a carriage unit, and. which has a latching geometry as well as a groove, and. in which at least one wall element is accommodated via a carriage unit, and. which has a latching geometry as well as a groove, and - at least one encasing element, which. is configured to be affixed to the guiding rail, and. is configured as a profile in an L-shape with a long branch, at which one latching hook is disposed, and with a short branch,. is configured to be affixed to the guiding rail, and. is configured as a profile in an L-shape with a long branch, at which one latching hook is disposed, and with a short branch, • wherein - the latching hook is configured to latch in the guiding rail in such a way that the encasing element is affixed to the guiding rail from a unidirectional vertical joining direction in a self-retaining manner, - the long branch extends in the vertical joining direction, - the geometric transition between the long branch of the encasing element and the latching hook has a cross-sectional constriction, - the long branch adjacent the area of the cross-sectional constriction has a web with a projection, and - the projection for self-retaining the encasing element at the guiding rail engages into the groove, - the latching hook is configured to latch in the guiding rail in such a way that the encasing element is affixed to the guiding rail from a unidirectional vertical joining direction in a self-retaining manner, - the long branch extends in the vertical joining direction, - the geometric transition between the long branch of the encasing element and the latching hook has a cross-sectional constriction, - the long branch adjacent the area of the cross-sectional constriction has a web with a projection, and - the projection for self-retaining the encasing element at the guiding rail engages into the groove, • the guiding rail, adjacent the groove, has a screw reception, into which a screw element is screwable, • by screwing the screw element clamping the web at the guiding rail is realized, and • the screw reception is configured at an angle (α) with regard to the vertical joining direction, in order to screw the screw element from the direction of a symmetry plane of the guiding rail, wherein the symmetry plane is located at half the width of the guiding rail.