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Thanks to both of you. Gaps between the hopper cars / wagons and coverings are definitely important.
The search request is on another topic, though. The invention specifically relates to an aerodynamic design, that possesses an aerodynamically beneficial construction / behaviour independent from its loading level and despite a permanent opening of its top side, as can be seen in the case description of our homepage (can't post links for being newbie...)
Questions are on competition on this specific market, potential licensees for this wagon design, information on market size, need / interest and life cycle for this technology.
Thought, maybe some of you might be able to contribute their expertise in aerodynamics and this field. I will definitely try to get in contact with Texas Tech University.
Thanks again...
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