A railway truck has two wheel sets, a bolster, and two side frames each having a bolster opening. At least one friction plate is connected to one of the bolster openings, a car body, and end portions of the bolster and extends generally vertically. Two suspension assemblies operatively connect the bolster to the side frames. Each suspension assembly includes at least one load supporting spring biasing a corresponding end portion of the bolster upwardly, two wedges disposed on either side of the at least one friction plate, and two springs biasing the wedges. Each wedge has a generally vertical and a sloping face. The two springs bias the sloping faces of the wedges against corresponding sloping faces provided in one of the bolster openings and end portions of the bolster such that the generally vertical faces of the wedges are pressed into contact with the at least one friction plate.