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Originally Posted by BluePatent
What would be so strange about aerodynamic Hopper wagons? Railway transportation has great energy losses due to poor aerodynamic behaviour. That's the starting point for the new invention features on our site.
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I recommend a look at the thread:'full-boat-tail trailer,' at Search EcoModder.
On page 25 of that link you'll find permalink#248,image 3,4,and 5 which are pictorial representations of drag data for railroad equipment reported by Sighard Hoerner in his book,"Aerodynamic Drag," from 1951.
Of special interest is the work of Oskar Tietgens when at Westinghouse Laboratories in the 1930s.He wind tunnel tested a self-powered railcar which registered Cd 0.08 in model form.
Also,you might contact the Dean of the Mechanical Engineering Department at Texas Tech University,Lubbock,Texas,U.S.A..
In the late 1970s,students were being invited to do R&D of railroad hopper cars.