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Engineering Disasters: Freight Train Collision

(44 min) tv-pg l 
Investigate a stage collapse at the Indiana State Fair that left seven concert goers dead. Next, find out if a gas leak is to blame for an explosion in New York City that leveled two buildings and killed eight people in their homes. Then, disaster strikes on an airliner at 36,000 feet as a gaping hole suddenly rips open inflight, and engineers in Japan scramble to save millions of lives as an epic radioactive release looms. Finally, see how a train crossing was the site of not one, but two disastrous auto collisions in a single year?