How is Dunkirk relevant when actual units, involved in the actual Barbarossa fighting completed the actual task of moving 2500 km?
No quarrel here.There is also the fact that to defend the Wolga,the Germans needed boots on the ground,and not tanks.
First the infantry would go to the Wolga, by train, than , small numbers of tanks and artillery would also go to the Wolga, also by train
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1) Germany had not 5 months to go to the Wolga
2) The focus on Guderian's tanks is wrong : the aim was for the three AGs to go to the Wolga and to occupy a line from Archangelsk to Astrachan,and this had to be done before the winter of 1941 .The distance AA is more than 2000 km ,thus the presence of the tanks of Guderian was irrelevant as they could occupy only a few % of this distance .
The plans were that after the Soviet defeat west of the DD line, some 50 divisions ( including the Pz and mobile units ) would return to Germany, 50 other units would be disbanded and 50 would be used for occupation duties . It was never the intention to go to the Wolga with the mobile divisions .If these divisions were going east of the DD line, how would they return to Germany ?