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Regarding articulated cars, after reading this thread I spotted how 'all purpose spine cars' are articulated and it is quite a bit different from newer cars. Another difference I've noticed some time ago on double-stack well cars is 38" wheels in the middle with 33" wheels at the ends. I've assumed this is because of the extra weight, but are there other reasons??? Does wheel size also affect tracking?? <br /> <br />Going back to steam, some of the Super Power Northerns, Hudsons, etc., had fairly large pilot wheels, IIRC late UP Northerns were ~40" and of course most passenger cars had larger wheels than freight. Were the large pilot wheels for speed, weight, or both???
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