Mr. Freeze at Six Flags St. Louis stalled and came to a stop in a valley Thursday. Riders had to be evacuated.
A power problem in the magnetic-powered launch motors caused the issue, the park said.
Mr. Freeze uses linear induction motors, called LIMs, to launch the six-car train through a tunnel, inverted top hat, overbanked turn and vertical tower. A second set of LIMs pushes the train farther up the vertical hill before it reverse course and travels through the elements again.
Six Flags said the coaster didn't malfunction but didn't have enough speed to make it finish the course. Riders were safely evacuated from a low section of track equipped for such an evacuation.
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