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Image
If you'll go to the 'full-boat-tail trailer' thread and swim through the images there,in the pictorial drag table for railroad vehicles you'll see an image for a self-propelled railcar from around 1935,with Cd 0.08,by Oskar Teitgens and his associate at Westinghouse Laboratories.
It would be a good starting point for aero.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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