A UP freight train was derailed after it entered a siding at speed. The switch was incorrectly set for the siding instead of the main line after a track crew had finished working. Although no-one was hurt, there was considerable damage. The four locomotives were damaged and seven freight cars destroyed. As the train derailed, it unearthed and broke an anhydrous ammonia line, struck and destroyed a ballast regulator, damaged a tamper, and struck and ruptured two grain elevator silos.