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A fireball erupts from the site of an oil-train derailment in December 2013 in Casselton, N.D. Several explosions occurred as several cars in the milelong train caught fire. (AP Photo/Bruce Crummy)

Derailments point to need for tank-car upgrades

Railroads have improved their tracks and lowered train speeds, but recent accidents show the key to increased safety may be better tank-car construction