A stabilized railway car truck consists of two side frames and a bolster. The bolster has laterally opposite ends, each end extending into and supported within a side frame opening on a spring group. The stabilized railway car truck also includes a transom extending into supporting contact with each sideframe by a hinge assembly. The spring group is supported at each transom end. The hinge assembly includes a pin arrangement that allows one sideframe to move vertically with respect to the other sideframe.