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If you have control over your lane, as with a railway, you don't need heavy crash protection. With less weight, there's less incentive for steel wheels, although they are wonderfully slender. In any event, adding wheels and a ground plane will have a lot of effect on the CD. To get those .0___ cd ratings, you need flawless shapes. Maybe our kids will think of trains as something that you can run your fingernails along without feeling anything until the little tick for the door seam, near the back, but it is a stretch for me. If fit and finish can save half our oil, it seems like a noble crusade.
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