Shuttle Loop

The first installation of a Shuttle Loop dates back to 1977 when King Kobra opened at Kings Dominion.[2][3] Two other rides were also installed that year: White Lightnin' at Carowinds and Tidal Wave at Marriott's Great America (California).[4][5] Tidal Wave at Marriott's Great America (Illinois) opened in 1978 and was the last to feature the weight drop launch system.[6][7] Also that year, Knott's Berry Farm opened Montezooma's Revenge and Six Flags AstroWorld opened Greezed Lightnin' as the first installations to feature the flywheel launch system.[7][8][9] A number of installations followed across the world.

Twenty-two theme parks have operated Shuttle Loops, with half of the twelve original installations being relocated at some time. As of September 2013, only six installations are operating, with another one in storage.[8][10][11][12][13][14][15] The remaining Shuttle Loops were either demolished or used for replacement parts on other installations.[12][16][17][18][19]

• The original King Kobra from Kings Dominion is the most traveled shuttle loop, having operated at Kings Dominion, Jolly Roger Amusement Park, Alton Towers and Hopi Hari.[13]
• Montezooma's Revenge at Knott's Berry Farm is the longest running shuttle loop that is still in its original location. All of the shuttle loops that were installed before it have either been moved or destroyed. Following the closure of Kentucky Kingdom's Greezed Lightnin' in 2009, "Zooma" became the only operating shuttle loop in the United States until Niagara Amusement Park & Splash World's Shuttle Loop.[20] As of February 2022, Montezooma's Revenge is under a major refurbishment and is set to reopen in 2024.
• Shuttle Loop at Nagashima Spa Land is the only remaining Shuttle Loop operating in Asia.[20]
• The first European Shuttle Loop, Sirocco, was installed in 1982 at Walibi Wavre in Belgium. In 1999, the ride was partially enclosed to reduce noise and was renamed Turbine. Turbine closed in 2008 and reopened in 2013 with a new train from Gerstlauer and a new name, Psyké Underground. The ride is now completely enclosed making it the first indoor shuttle loop.
• The shuttle loop, Greezed Lightnin', that operated at Kentucky Kingdom from 2003 to 2009 was composed of the two Tidal Wave Shuttle Loops from the Marriott's Great America parks in California and Illinois.[12]
• The final new installation was Shuttle Loop at Oyama Yuenchi in 1990.[16]

Montezooma's Revenge at Knott's Berry Farm

On August 27, 1997, the Sirocco at Walibi Wavre failed to launch at the correct speed. The train went to the loop very slowly and up the spike, to roll backwards. During the backwards passage of the loop, the train halted at the uppermost point, causing the train to get stuck hanging upside-down. The passengers were hanging heads-down for one hour and twenty minutes, only held in place with lap bar restraints. The train was pulled back further down the track with help of the local fire station brigade.[38][39]

A 20-year-old woman died on September 1, 2001, one day after riding Montezooma's Revenge, the Shuttle Loop at Knott's Berry Farm. She suffered a ruptured middle cerebral artery, and an autopsy revealed a pre-existing condition. The ride was closed for several days while an investigation was conducted. Though state investigators concluded that the ride did not contribute to her death, a wrongful death lawsuit was later filed by her family in 2002.[40] The lawsuit was dismissed in 2006.[41]

• US 4165695 Amusement ride with vertical track loop
• Shuttle Loop at the Roller Coaster DataBase