Usually, whenever we think of trains and physics, they've teamed up against some wimpy opponent, like an eighteen-wheeler. This time, physics and mother-nature tag-team a train.
Physics, this time in the form of our old friend F=m*a, shows up twice.* First, F reveals herself through through the form of wind, where a small amount of mass moving at high speed derails the lighter bits of a train. Then, she shows up again in the form of a very large amount of m conserving its momentum right into the backside of a previously-unscathed boxcar. Let's just remember, that even though the a isn't very spectacular, F was still sufficient to throw a real train just as far as a three-year-old can throw his toy one.
Wind action starts around 1:00, watch to the end for a tanker-skidding-with-sparks-to-complete-devastation ending.
*Well, more than that, but I'm simplifying for dramatic effect here, d---it.
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