"Extremeroller was a steel stand-up roller coaster at Worlds of Fun in Kansas City, Missouri. It was built by Arrow Dynamics and the first stand-up roller coaster in the United States. It was built in 1976 under the name Screamroller. In 1983, Arrow designed a stand-up train for the attraction, which was subsequently renamed Extremeroller (also known as EXT)."@en . . "Extremeroller"@en . .