Locomotive vehicles can produce violent vibration and snaked motion during operation. In order to enhance the operation safety and comforts for locomotive vehicles, damping components ( oil pressure vibration damper ) are adopted between the wheel and vehicle chassis / vehicle body and vehicle chassis. This can also enhance the operation life and reduce operation cost. In 2014, Leeman Hydraulic Technology Company Ltd has already started to produce suspension core components for high speed train – oil pressure vibration damper. 。 

According to the installation position of the oil pressure vibration damper, it is classified into primary vertical damper; secondary vertical damper, secondary horizontal damper and yaw damper.