Two of the train cars involved in a recent bridge collapse, train derailment and fire on a railway bridge over Tempe Town Lake contained toxic chemicals. In the wake of the accident, Kiril Hristovski, a Fulton Schools associate professor and chair of the Environmental and Resource Management program, talks about challenges involved in hazardous materials transport and handling of toxic materials. First responders to the railway destruction in Tempe did a professional job, keeping a dangerous situation from becoming more serious, Hristovski says. But he adds that the potential for such situations to quickly become more threatening to people and property make it imperative for all possible precautionary measures to be put into effect to prevent such incidents from happening.