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In doing some research for my Red Germany TL I came across of information regarding the differences between German rail and Russian rail during the pre-war, WW1, and interwar period.
In a general sense the Russians used a broader gauge compared to the narrower gauge of German rail, which of course prohibited the use of each other's domestic built locomotives from traveling seamlessly onto each others' system.
So with that being said, considering that the Molotov-Ribbentrop pact of '39 had various joint economic trade provisions attached to the agreement, how technically plausible could it have been that that some sort of standardized rail gauge system between the two countries could be created to better facilitate their economic cooperation?
If 39' was too late, could something be like that be created earlier? (post October revolution, specifically)