An adapter pad system including a roller bearing adapter and a roller bearing adapter pad for placement between a roller bearing and side frame pedestal roof of a three-piece railcar truck.

An assembly for positioning a wheel of a rail vehicle. The wheel is supported on a wheel shaft and there is provided a swing arm and a frame of a bogie of the rail vehicle. The swing arm has a first end that is connected to the frame of the bogie in a rotationally mounted manner. The swing arm has a second end that is connected to the wheel shaft. The swing arm has a fixed, but detachable, connection between the first end and the second end which allows for the swing arm to be mechanically divided into two.

An assembly for positioning a wheel of a rail vehicle. The wheel is supported on a wheel shaft and there is provided a swing arm and a frame of a bogie of the rail vehicle. The swing arm has a first end that is connected to the frame of the bogie in a rotationally mounted manner. The swing arm has a second end that is connected to the wheel shaft. The swing arm has a fixed, but detachable, connection between the first end and the second end which allows for the swing arm to be mechanically divided into two.

An underneath type railway freight car bogie wheelset radial device has front and rear subframes and two cross-arranged connecting rods that are pinned by round pin connectors. The subframe is a combination structure of the adapter and the lateral arm. The connecting rods are arranged under the bolster to form the underneath bogie wheelset radial structure. The height of the central plane of the connecting rod is lower than the height of the central plane of the subframe adapter surface. The adapter has an adapter surface forming an arc-shaped adapter structure and an adapter connecting arm integrated with the adapter surface structure and vertically arranged at one end of the adapter surface; the subframes are fixed to the adapter by the rivet assembly.