How about the evaluation of the four axle Howell tank car

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Optimizing the design of railway tank cars to minimize ...

May 01 2007 ยท An implication of the model described here is that it leads to different optimal tank thickness for tank cars designed for different density products. As discussed above the size of normal 4-axle tank cars varies from less than 13000 gal to approximately 33000 gal depending upon the density of the product they are designed to transport.

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