Imagine a freight train derails and emergency responders rush to the scene, only to find the derailment worse than they thought. They discover an improvised explosive device (IED) on one of the derailed tank cars that was spewing toxic chemicals.
Fortunately, this was just a training exercise. An IED was discovered (for the exercise) in this rail car. An IED was discovered (for the exercise) in this rail car. The TSA Phoenix surface field office hosted the exercise for Union Pacific, the largest railroad in North America, covering 23 states across the western two-thirds of the U.S.
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Source: U.S. Transportation Security Administration