XLR-8 was manufactured by Arrow Dynamics (then called Arrow-Huss) and was the second suspended coaster built by Arrow, fixing the problems of the failed Bat at Kings Island.
For AstroWorld's Fright Fest 2002 event, the last four cars were reversed, which had never been done before on a suspended roller coaster. The name was also switched to "8-RLX". The change was successful and the trains remained like that until AstroWorld's closure in 2005, however the name was reverted after the Fright Fest.
AstroWorld closed permanently in 2005 when Six Flags decided to sell the plot. On February 3, 2006 the ride was sold for $50,000 as scrap. The trains where sent to Six Flags Magic Mountain as spare parts for similar roller coaster Ninja.