Brigham Young wanted the railroad badly, right up until it threatened to destroy the isolation that made Mormon Utah possible. This week, Lindsay Hansen Park and Bryan Buchanan dig into the chaotic arrival of the transcontinental railroad, where unpaid Mormon laborers, corporate brinkmanship, ZCMI boycotts, excommunications, Chinese railroad workers, and a very angry Brigham Young all collide. It is the story of a prophet trying to profit from disruption while simultaneously building walls against it, and of the technology that helped strengthen Zion, then cracked it open.