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https://www.youtube.com/watch?v=LGIr3nMtrSM

This could actually tilt the supply issues of post nuclear warfare in the favor of the Soviets.

Sure, it might not effect the situation in Poland *that* much, but it would possibly mean that the soviet units closer to the soviet border could have access to semi-regular supply refills.

and in the alternative timeline with no soviet collapse, these steam train reserves would have still been "fully" operational.