Abstract: Sole-bars (1) bear on axles by elastic suspensions (12) with frictional damping. The bolster (18) bears by elastic blocks (32) on the lower side of a window (24) through each sole-bar. Each elastic block (32) bears on a face (31) of the sole-bar which has, in relation to the longitudinal direction (L) of the bolster (18), an inclination (A) such that the compressive force (F) of the elastic block has a horizontal component (F.sub.HT) which pushes the sole-bar so as to bear by its reference face (26) against a parallel reference face (28) belonging to the bolster. Thus, the sole-bars (1) are constantly returned to a favored configuration of perpendicularity in relation to the bolster. Use for effectively combatting parasitic deformations and sideways movements of deformable-frame bogies.