The safety and stability of our products in rail transit vehicles have always attracted much attention. The operation of our products is more efficient, quieter and safer. Railway operation requires technical and economic solutions with low life cycle cost. Therefore, the axle box bearings need to minimize maintenance requirements. The axle box bearings must be able to operate under fully loaded vehicles and extreme weather conditions. Some axle box designs also adopt the form of bearing saddle. The typical requirement of freight cars is to achieve extremely long working hours and maintenance intervals.