Railcar bogie bearing adapter construction

An integrally cast bearing adapter arrangement is provided in the pedestal of a railcar bogie side frame, which side frame (12) is cast with a pedestal jaw (24) having a roof (62), and vertical walls of a first (84) and second (86) leg which roof and walls operate as a bearing adapter (80) to receive and grasp a bearing assembly outer surface (56) at a horizontal diameter (90) of said bearing assembly for an axle end without introducing the manufacturing and assembly tolerances from discrete component assemblies, thereby avoiding the lateral displacement associated with the added tolerances and operating to minimize angular displacement between each mated axle and side frame.