If I recall, the Soviets were using their tried and true Napoleonic Wars tactic of burn everything useful to the Nazis on the way out. It is a long ways from the Volga to Poland and any useful fields for the German soldiers. While the Russians would in theory have a similar problem on their run back across that region in 1944, they did have the right gauge trains to run on the rails.
Germany's Army only really worked as long at it had momentum. The Russians outnumbered the Germans in almost all areas if I recall, and the Russians had been preparing to invade German Europe at the time the Germans attack in June of 1941. If the Germans delayed, I am positive Stalin would have invaded Germany in 1942.
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