Fallout 4 (2015) (RU) + "Afterglow" + pack of modifications. Medium difficulty. Part 30.
It seems that to proceed further with the railroad quests it's required to get into "temporary alliance" with the institute, or rather I say otherwise it would not be possible to proceed further in the building - all doors will be closed, no keys around. Still, by other hand, there is a option in dialogue exist, that allow to take some time to think about are you planning to cooperate with the faction or not, which I didn't try out here and done on it in next part, 31, by loading an older save.
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