Between Springville and Gilluly, a distance of 34 miles, there are three crossovers. At Castilla and Narrows, the crossover would take a train from running on the lefthand main to the righthand main. Rio, in between Castilla and Narrows, would allow a train to cross from the righthand main to the lefthand main. Here at Rio, BNSF's Denver-Provo is already on the lefthand main (from the train point-of-view), Main 2, as it heads west.
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