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I recall a reference in <em>Trains </em>stating that they were designed to buckle right behind the cab in order to protect the crew in the case of head-on collisions.  Apparently the buckling was intended to absorb energy that otherwise might crush the cab.  I can see how the buckling might appear to be a design flaw in the form of a weakness in the frame that allows the buckling.  But my understanding is that it was an intentional design feature, kind of like how a fuse is the weakest link for the purpose of protecting the rest of the circuit.
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