The River King Mine Train at Six Flags St. Louis was named for the River King Coal Mine located in Freeburg. The 2,000-acre mine site was operated by Peabody Coal (now named Peabody Energy) from 1957 to 1989. After the closure of the large mine in 1989, Peabody donated some 1,800 acres of the 2,000-acre site to the Illinois Department of Natural Resources in 1994. The site is now the state owned and managed Peabody-River King State Fish and Wildlife Area and is open to the public for use by anglers, hunters, and other outdoor enthusiasts for recreational opportunities in the southeastern portion of Greater St. Louis.