Railway bearings need to comply with highly demanding reliability and space-saving requirements. BUT offers a comprehensive range of bearing configurations for most wheelset designs. The most common designs include: double row tapered roller bearings in face-to-face arrangement (TDI); double row tapered roller bearings in back-to-back arrangement (TDO); single spherical roller bearings; paired spherical roller bearings; and paired cylindrical roller bearings (NJW+NJPW).