System comprising a side skirt for a car of a multi-car vehicle, and a side skirt support, the side skirt being suitable to cover a space below the underframe of the car from a side, the side skirt having a coupler side edge that forms a side of the side skirt, the coupler side edge being suitable to be arranged next to a coupler head of the car, the side skirt also having a rear side, whereby a reference line is defined to be a line that connects a point on the coupler side edge with a point on the rear side, whereby • the side skirt support is suitable to attach the side skirt to the underframe of the car, • the side skirt support has a bar that has a first joint, the first joint being suitable to be attached to the underframe to allow the bar to rotate relative to the underframe, whereby the bar is attached to a part of the side skirt by way of a second joint that allows the part of the side skirt to rotate relative to the bar, whereby the side skirt and the side skirt support have a normal position, in which the bar is arranged to point into a first direction, and whereby the side skirt and the side skirt support have a displaced position, in which the bar is arranged to point into a second direction, whereby the reference line is pointing into a normal position direction, when the side skirt and the side skirt support are in the normal position, and the reference line is pointing into a displaced position direction, when the side skirt and the side skirt support are in the displaced position, whereby the system further comprises a rotation controller that limits the amount of rotation that the side skirt performs between the normal position and the displace position, such that • the normal position direction is equal to or parallel to the displaced position direction or • the angle between the normal position direction and the displaced position direction is smaller than 30°. • the side skirt support is suitable to attach the side skirt to the underframe of the car, • the side skirt support has a bar that has a first joint, the first joint being suitable to be attached to the underframe to allow the bar to rotate relative to the underframe, whereby the bar is attached to a part of the side skirt by way of a second joint that allows the part of the side skirt to rotate relative to the bar, whereby the reference line is pointing into a normal position direction, when the side skirt and the side skirt support are in the normal position, and the reference line is pointing into a displaced position direction, when the side skirt and the side skirt support are in the displaced position, whereby the system further comprises a rotation controller that limits the amount of rotation that the side skirt performs between the normal position and the displace position, such that • the normal position direction is equal to or parallel to the displaced position direction or • the angle between the normal position direction and the displaced position direction is smaller than 30°. • the normal position direction is equal to or parallel to the displaced position direction • the angle between the normal position direction and the displaced position direction is smaller than 30°.