Understanding Ballast Behavior

This article presents a look at ballast behavior for railways as well as a description of devices used to deliver the ballast. Using discrete element modeling (DEM), researchers investigated the effects of the ballast aggregate size, angularity, shape, disturbance, as well as tie texturing on the stability of the track laid atop the ballast. Researchers found that rounded stones had better resistance to permanent deformation due to their small voids as compared to highly angular stones. Fouled ballast was also analyzed using DEM. A number of companies that distribute ballast are also discussed. The article describes the machinery used for this distribution as well as the company’s economic considerations. Some such devices include shoulder plows, tamping machines, center X-plows, and ballast brooms.