Well, there you go. Here is the reply I had prepared before I Refreshed and saw aerohead's contribution:
Quote:
A-ha! We *are* talking about what I would call 'hopper cars'.
There isn't a lot of overlap with aerodynamic road vehicles, where there are lots of constraints that aren't shared with railroad rolling stock, i.e., where do you put the license plate, & etc.
The only things I've seen posted here that relate are these:
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Looks like I missed one of Hoerner's illustrations.
Also, compare with the tarps on garbage or wood chip trucks
