A rail vehicle unit, comprising - a first vehicle component, - a second vehicle component and - a rolling support device; - said rolling support device counteracting rolling motion between said first vehicle component and said second vehicle component about a rolling axis; - said rolling support device comprising a torsion bar (112.1), a first torsion arm (112.2) and a second torsion arm (112.3); - said first torsion arm (112.2) being rotationally rigidly connected to a first end section of said torsion bar (112.1) and being articulated to said first vehicle component; - said second torsion arm (112.3) being rotationally rigidly connected to a second end section of said torsion bar (112.1) and being articulated to said first vehicle component; - said torsion bar (112.1) being pivotably mounted to said second vehicle component via a first support element (113.1) and a second support element (113.2), said first support element (113.1) and said second support element (113.2) being mutually spaced by a support distance along a longitudinal torsion bar axis (112.6) of said torsion bar (112.1); characterized in that - at least one intermediate element (114.1, 114.2) is provided; - said intermediate element (114.1, 114.2) being connected to said second vehicle component and cooperating with said torsion bar (112.1); - said intermediate element (114.1, 114.2) being located between said first support element (113.1) and said second support element (113.2). - said intermediate element (114.1, 114.2) comprises a damping element (114.3); - said damping element (114.3) cooperating with said torsion bar (112.1) to damp bending vibrations of said torsion bar (112.1) about a bending axis running transverse to said torsion bar axis (112.6). - a first vehicle component, - a second vehicle component and - a rolling support device; - said rolling support device counteracting rolling motion between said first vehicle component and said second vehicle component about a rolling axis; - said rolling support device comprising a torsion bar (112.1), a first torsion arm (112.2) and a second torsion arm (112.3); - said first torsion arm (112.2) being rotationally rigidly connected to a first end section of said torsion bar (112.1) and being articulated to said first vehicle component; - said second torsion arm (112.3) being rotationally rigidly connected to a second end section of said torsion bar (112.1) and being articulated to said first vehicle component; - said torsion bar (112.1) being pivotably mounted to said second vehicle component via a first support element (113.1) and a second support element (113.2), said first support element (113.1) and said second support element (113.2) being mutually spaced by a support distance along a longitudinal torsion bar axis (112.6) of said torsion bar (112.1); characterized in that - at least one intermediate element (114.1, 114.2) is provided; - said intermediate element (114.1, 114.2) being connected to said second vehicle component and cooperating with said torsion bar (112.1); - said intermediate element (114.1, 114.2) being located between said first support element (113.1) and said second support element (113.2). - said intermediate element (114.1, 114.2) comprises a damping element (114.3); - said damping element (114.3) cooperating with said torsion bar (112.1) to damp bending vibrations of said torsion bar (112.1) about a bending axis running transverse to said torsion bar axis (112.6).