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This example shows a problem that can occur in long trains is the damping in the buffers or couplers not is sufficient.
The vehicles in this example have only longitudinal degrees of freedom. The big vehicle to the right is the locomotive. What happens in this scene is that the locomotive first brakes, which compresses the whole train. Then it suddenly accelerates, pulling the whole train-set apart. Due to the slack in all couplers the acceleration of the car-bodies will be very high. The acceleration in the last wagon will be over 5 [m/s2], which causes its load to slide.