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RobertRoche

Aerodynamic train lab

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There's a lot of windage loss under the train, too, but you need the track to be moving to properly assess that situation.

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The hoppers have been modified underneath as you suggested. You would think that this would have been adopted more widely by train operators and haulers  but I see maybe 1 in 100 trucks in the US with  skirts under the trailer, between the cab and trailer, or behind the trailer itself.  Of course the suggested form of energy would have us going back to coal 😏  

Edited by DiveController

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