Shim

Urethane Railcar Chocks designed specifically for tank cars and other freight cars loading or unloading hazardous materials, and where a spark from a steel wheel chock could ignite dust or fumes. Our spark-proof Urethane Wheel Chocks are tough enough to block a tank car, but resilient enough that the car can be pulled over the chock by a locomotive without derailing. No more trying to yank free a steel chock that is stuck under a wheel. When it’s time to move, just pull the car over the chock and retrieve the chock later. Works on all train rails from 75lb/yd to 141lb/yd and wheel diameters 28″ – 44″.