Abstract: A truck or double bogie having forward and rear elemental bogies (1, 2). The vehicle body is carried at the middle by a spanner bolster or two longitudinal coupling beams (8, 9) which are supported, at each end and on each elemental bogie, on the ends of a transverse swingle bar (12, 13), resilient blocks (15) being inserted between the swingle bar and the bolsters (3, 4) of the elemental bogie. The buffer and coupling bodies (34) are arranged at the end of a guide shaft (32) which is freely articulated on a vertical central pivot (30) rigidly fixed to the vehicle body and on the vertical pivot (5) of the forward elemental bogie (1). The device is intended for use with bogies for railroad vehicles intended to run on poor quality track.