The Flash: Vertical Velocity is an inverted steel roller coaster located at Six Flags Great America in Gurnee, Illinois. The roller coaster is themed to the DC Comics character, The Flash. Originally named Vertical Velocity, the ride received a re-theme in 2022.
Inverted roller coaster
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An inverted roller coaster is a type of steel roller coaster in which the train runs under the track with the seats directly attached to the wheel carriage. Riders are seated in open cars, letting their feet swing freely. The inverted coaster was pioneered by Swiss roller coaster manufacturer Bolliger & Mabillard in the early 1990s with the development of Batman: The Ride, which opened at Six Flags Great America on May 9, 1992.
Nemesis at Alton Towers in 2010
A Bolliger & Mabillard inverted roller coaster, Nemesis Inferno at Thorpe Park
A Vekoma built inverted coaster, Kumali at Flamingo Land Resort
A Bolliger & Mabillard inverted coaster, Nemesis Reborn at Alton Towers