The important railway fastener is the iron insulator railway from chinahutong's blog

Railway elastic clamps are used to secure the track to the bottom plate with concrete sleepers. By bending and deforming, the insulator railway can apply pressure to the rail, preventing longitudinal movement of the rail, either through temperature changes or through vibration. In general, the insulator railway adopts forged spring steel produced by hot forging process. Because the microstructure of insulator railway is the most uniform, it is considered to be a better forming process than other metal forming processes.

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