<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/#comment-17959>
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"Dave, I defer to your superior knowledge of Caterpillars! Clearly my 15 minutes sleuthing the Internet led me to some false conclusions. I didn't know that Caterpillar was a brand name before the company came into existence.  Ok, I back this right on up to ca 1920 then.  The cars in that one shot are hard to distinguish but all of them have styling consistent with 1920.  -Jim "
<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/?tab=comments#comment-17947>