The Flash: Vertical Velocity, Steel roller coaster at Six Flags Discovery Kingdom, Vallejo, California, US.
The Flash: Vertical Velocity is a steel roller coaster at Six Flags Discovery Kingdom in Vallejo, California, where riders sit in inverted cars that hang below the track. The coaster uses linear induction motors to launch passengers in both directions along a short track at high speed.
The coaster opened in 2001 but its original height exceeded local regulations in Vallejo. The structure was modified in 2002 to meet the city's height limits.
The name references the DC Comics character and connects the ride to a familiar superhero universe that park visitors recognize. This themed attraction sits within the park's broader comic book entertainment zone.
Riders must meet both a minimum and maximum height requirement, so it is worth checking before joining the line. Visiting earlier in the day tends to mean shorter waits, especially on busy weekends.
The coaster has a rollback system that automatically stops and reverses the train if it does not gain enough speed during launch. The front tower has a twisted spiral shape that makes it easy to spot from a distance inside the park.
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