Features of ballastless track fasteners

Fasteners used in high-speed railways are an important component to adjust the geometric dimensions of the track. In particular, the ballast layer has been canceled for the ballastless track and replaced with a rigid or semi-rigid ballast bed, which was originally provided by the ballast. Elasticity, which is convenient for adjusting the geometric shape of the track. It needs to be realized by fasteners.

The track elasticity is changed from "fastener + track bed" to only provided by the fastener, and high-speed driving has higher requirements on the elasticity of the fastener; the geometric shape adjustment "fastener + track bed" is only realized by the adjustment of the fastener. Therefore, the fastener is required to have low stiffness and large adjustment, and the fastener becomes the most critical component of the ballastless track.