From the Commissar of Production - Factory Evacuation

[Weasel]

Doing some more reading, searching for RAILYARD (sic) instead, it seems that the more rail in a hex the larger the chance for a factory to expand (21.1.8). So Vologda with a RC of 1 will provide a smaller chance of expansion to the undamaged factory than say Moscow with a RC of 30. I guess that is the effect as I cannot see anything that says it bottle necks production. It doesn't say how much each RC point affects the chance, but I will take it as a 1 meaning 1% for now.

I guess that is what you intent was?

I am currently running a test game for the factories per your suggestion.