Railcar wheel chocks are designed to prevent railcars from sliding on tracks during maintenance (even a small gust of is capable of rolling a railcar). These chocks feature rigid steel construction with yellow finish & a warning flag (selected models) to indicate maintenance requirement. Selected models can also be doubled with a chain or rope to keep the chocks together. These OSHA regulated railcar wheel chocks are available in 41 and 12.5 inch depth options on Raptor Supplies.