The first stand-up roller coaster in the United States was, like the Japanese roller coasters before it, a modified attraction. Arrow Dynamics built one of its signature corkscrew roller coasters, named Screamroller, at Worlds of Fun in Kansas City, Missouri in 1976. In 1983, Arrow designed a stand-up train for the attraction, which was subsequently renamed Extremeroller (also known as EXT). However, the track and structure were never designed for stand-up trains, and the original sit-down trains were reinstalled in 1984, remaining in place until the attraction was removed in 1988.