The amusement park said the Flying Dinosaur roller-coaster's two carriages stalled midway through the 1,100-metre ride, with riders suspended in a flying position about 30 metres above the ground.
One of the carriages stopped at the terminal level, but the other was stuck at about 100 feet in its upward path, leaving its passengers facing the drop below them.
They were all guided to safety via a passageway along the rail of the rollercoaster. The excitement to ride Jurassic Park-inspired "Flying Dinosaur" roller coaster was evident from riders' faces.
Rollercoaster riders left dangling upside down for hours at Universal Studios in Japan
The ride resumed operation after repairs and safety checks.
The park operator said it has replaced the faulty motor control part that caused the incident, NHK reported on Wednesday.
"It's scary to think (about) if we had been on board".
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Kyodo said the ride had two similar incidents past year.
Universal Studios Japan was packed with holiday-makers at the time - during the country's "Golden Week", where the majority of Japanese workers are given a week off around the end of April due to a cluster of national holidays at that time.
No one was injured in the incident, and riders lined up to give it a go when the coaster reopened later in the day.
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Tuesday's incident was not the first time the ride ran into trouble. "It's already a terrifying ride, so I want them to operate it safely".
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This incident is known as the Haymarket affair or the Haymarket Massacre, named after the area where the incident occurred. One meeting was held opposite the Madras High Court on the Marina beach and the other was held at Triplicane.