Production of the STZ-5 started in 1937 at the Stalingrad tractor plant and became the Soviet Union’s most-produced artillery tractor during World War II. The vehicle had remarkable endurance, with some traveling from Stalingrad to Moscow and back — more than 500 miles each way — without breaking down. Despite that service record, there have only been a couple of 1/35 scale kits of the STZ-5 over the years, so this is a welcome addition.