Articulated vehicle, e.g. articulated bus or rail vehicle

The articulated vehicle has two vehicle portions articulately connected with each other. A bellows side wall (10) is provided in area of the side wall of the vehicle portions at both sides for bridging the distance of the vehicle portions. The bellows side wall is extended from a front side (1) of one vehicle portion to front side of another vehicle portion. The bellows side wall has units on its inner side for stiffening the side wall in direction transverse to longitudinal axis of the vehicle.