Green Lantern rollercoaster at Warner Bros. Movie World Australia, appears to have lost one of its wheels during a full cycle.
http://mobile.news.com.au/national/emergency-crews-rush-to-help-people-stuck-on-green-lantern-ride-at-movieworld/story-e6frfkp9-1227263429855
No injuries reported, but something terribly wrong has happened here.
There is always the risk of a catastrophic failure of a part due to hidden flaws during manufacture. With all the possible outcomes, it could have been worse.
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Just to update this, there were injuries (one man had broken ribs and a punctured lung) and the ride car completely de-railed from the track. Apparently rescue authorties were at first unsure what stopped the cart from crashing to the ground. This was a major failure for a very young coaster. The cause is yet to be determined.