I realize that everyone on these forums is probably sick of these already, but I looked and couldn't find a thread for this specific possibility. What if, around the time the Germans start to think seriously about invading the USSR (mid 1940, wasn't it?), the high command had ordered as many of their factories as possible to switch to producing rail cars fitted to the Soviet gauge? Assume, for the sake of argument, that they achieve the same surprise as OTL. How many could be produced, and what effect would this have on the logistics of Barbarossa? In particular, I would be interested in the opinions of ObsessedNuker and Wiking.