Widely unknown, the Russian tractor industry which later in war almost completely switched to tank production was erected with massive American assistance in the late 20s and early 30s of the last century.
The young communiste state had such an urgent need for agricultural machines that many of the so-called »Tractor Zavod«s were established nationwide, among those the
Chelyabinskii Traktornyi Zavod imeni Stalina (»ChTZ«).
The sons of Stalin (»Stalinez«) S-60 and
S-65 produced during the late 30s were copies of the
Caterpillar 60, fitted with petrol/diesel engines and to a certain amount with wooden closed cabs.
Concerning the fierce Russian climate it's no surprise that intact cabs of otherwise damaged trucks - domestic, U.S. or captured - found their way to open Stalinez crawlers.