Everyone has known for a long time that russian railroads were one of russia's great weaknesses. That they rely too much on them. The fact that Ukrainians are blowing them up in large numbers now makes me suspicious, that Biden/Sullivan may have told them not to do it.
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https://en.m.wikipedia.org/wiki/Russian_Railway_Troops
And you can strike those trying to clear the blockage too.
Railroad sabotage should be used as a tactical tool not strategic.