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The patent illustrations show some filler fairing devices fitted into the gaps between the stacks.  It appears that they are not permenatly attached to the cars or the containers, but rather, are attached by hang hooks to the ends of the containers.  I suppose track curves would affect the shape of the gaps, so filling the entire gap between stacks with a solid filler structure would not be possible.  The gaps would have to be filled with a giant sponge with a smooth skin on it.  But then those sponges would have to be attached securely so they don't blow off in the wind.  I think a lot of benefit would flow from streamlining the whole train as if it were a big worm with no gaps and flat faces running into air.  But that seems like a mighty big engineering challenge.  If gap fillers were added to the train, it would take a lot of time and labor to attach all those pieces to the containers.
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