Abstract: A railway truck assembly including a central hollow beam extending transversely of the assembly and adapted for supporting a railroad car. Four wheel units are attached to the central beam with two of the wheels being aligned adjacent one end of the beam and the other two wheels aligned and extending from the opposite end of the beam. Each wheel unit includes inside and outside arms for supporting an axle at the distal ends for, in turn, rotatably supporting a wheel. The arms extend from a torsion bar support sleeve which, in turn, surrounds a torsion bar. The outward end of each sleeve is splined to the torsion rod and the inward end of the torsion rod is splined to a reaction sleeve which is, in turn, secured to the central beam. The outward end of each torsion bar is supported by a bearing in a cage member secured to the central beam and the inward end of each sleeve member is rotatably supported by a bearing engaging the splined inward end of the torsion rod.