Occasionally the NARA image collection throws up something quite weird. Like the attached - said to have been taken in October 1917 and
is of a retreating Russian artillery piece alongside a British armoured car. The artillery piece is, I think, a 152mm Canet gun on an improvised carriage.
The towing vehicle is tracked - I thought Holt 75 for a while but I'm not sure now.
According to Caterpillar Holt's recording 80 machines in all were delivered to Imperial Russia; 20 Holt-60 and 60 Holt-75. Tracks with add-on claws like in this case were frequently seen.
The Caterpillar Tractor Co. publication "50 Years on Tracks" of 1954 (more a venture in advertising than in providing clear data) claims Type 60 machines were running about in 1911 already. I'd say it was the precursor of the Type 75 (which probably was the answer of the Holt Company to the Best 75 Tracklayer of 1913). Holt Type 30 and 60 machines were prominent on the US domestic market in those years. And Leo Steiner of Budapest bought a Type 60 as his first tracked tractor in 1911 or 1912.
