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The long-anticipated RingRacer at Germany's Nurburgring racetrack is set to join the ranks of the fastest roller coasters in the world when it reopens this summer after a four-year delay. Within weeks of the debut, a problem with the launch system forced the closure of the new coaster. A few months later, an explosion while testing the pneumatic launch injured seven people and damaged a nearby building, according to the General-Anzeiger newspaper.
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