Wall module for a component of a carriage body of a rail vehicle, composed of: - a portion of an outer sheet-metal panelling having an inner surface, - a number of linear stiffening elements which extend substantially parallel to one another, and also along the portion of the outer sheet-metal panelling, and protrude beyond the inner surface of the portion of the outer sheet-metal panelling, and - framework structure members which extend substantially parallel to one another, perpendicular to the stiffening elements and parallel to the portion of the outer sheet-metal panelling and are connected to the portion of the outer sheet-metal panelling in a materially bonded manner, wherein - the stiffening elements extend beyond the region of a plurality of framework structure members in an interruption-free manner and are an integral or integrated constituent part of the portion of the outer sheet-metal panelling, - the framework structure members have formed notches at the points of intersection with the stiffening elements, said formed notches receiving the stiffening elements passing through, wherein - some or all of the formed notches have a form which, after positioning of the framework structure members with respect to the portion of the outer sheet-metal panelling having the stiffening elements, in interaction with the stiffening elements of the outer sheet-metal panelling, brings about a form-fitting temporary self-fixing of the framework structure members relative to the portion of the outer sheet-metal panelling having the stiffening elements, even without the materially bonded connection, characterized in that each stiffening element comprises a web profile which is formed in an integrated or integral manner with the outer sheet-metal panelling and a hollow body profile which is arranged at that end of the web profile which is remote from the outer sheet-metal panelling, wherein the hollow body profile can be brought into engagement with the formed notch, and wherein the form-fitting temporary self-fixing is formed by interaction of a notch portion of the formed notch with the hollow body profile. - a portion of an outer sheet-metal panelling having an inner surface, - a number of linear stiffening elements which extend substantially parallel to one another, and also along the portion of the outer sheet-metal panelling, and protrude beyond the inner surface of the portion of the outer sheet-metal panelling, and - framework structure members which extend substantially parallel to one another, perpendicular to the stiffening elements and parallel to the portion of the outer sheet-metal panelling and are connected to the portion of the outer sheet-metal panelling in a materially bonded manner, - the stiffening elements extend beyond the region of a plurality of framework structure members in an interruption-free manner and are an integral or integrated constituent part of the portion of the outer sheet-metal panelling, - the framework structure members have formed notches at the points of intersection with the stiffening elements, said formed notches receiving the stiffening elements passing through, - some or all of the formed notches have a form which, after positioning of the framework structure members with respect to the portion of the outer sheet-metal panelling having the stiffening elements, in interaction with the stiffening elements of the outer sheet-metal panelling, brings about a form-fitting temporary self-fixing of the framework structure members relative to the portion of the outer sheet-metal panelling having the stiffening elements, even without the materially bonded connection,