US railroads are highly efficient at moving freight. Indeed, our freight rail system is the envy of the world, but sometimes accidents occur. When train derailments occur, the outcome is usually minor, but occasionally more serious problems arise.

To understand the causes and prevention of train derailments, we’re talking with Dr. Allan Zarembski, Professor of Practice and Director of the Railroad Engineering and Safety Program at the University of Delaware. He’s an expert on railroad track engineering, safety, and derailment analysis.