Brad,
The tracks referred to in the photo caption as being fitted to the Diamond T's were probably bogie chains. These are just like standard mud chains but instead of going over just one set of wheels they wrapped around both forming a sort of half track.
I have two sets, one to fit a GMC 6x6 and a larger set to fit something like a Diamond T or Mack.
I have seen experimental clip-on tracks with proper plates etc but never a photo of them in active service. More than likely these were the bogie chains which feature in a few photos I have seen over the years.
Lang
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