Abstract: The deformation element (1) of a rail-borne vehicle is disposed in the region of at least one deformation zone (3) located on the end side of the vehicle, wherein the deformation element (1) is formed as a tubular hollow box (6) with at least one sidewall (9) of the deformation element (1) being formed with a polygonal cross-section comprises an inwardly directed indentation (4), wherein the indentation (4) is provided on the longitudinal-side end region of the deformation element (1) remote from the rail-borne vehicle underframe (2).