Cedar Point personnel reopened the Magnum XL 200 just after 11 a.m. Sunday morning, nearly 24 hours after it was closed due to malfunction.
One of the coaster's trains collided with another Saturday morning, causing minor damage to both trains and minor injuries to at least three passengers.
Park Spokesman Robin Innes said on Sunday the accident was caused by rain.
"We think it was just caused by excessive moisture on the tracks due to the heavy rain storms we had in the morning," Innes said.
The first train was said to be traveling less than 10 mph when it collided with the other train and both received minor damage to their fiberglass bodies as a result.
"Right now it's just operating with one train while the other two trains from yesterday are being inspected," Innes said.
Innes said he was confident the ride will not have any more related problems.
"Safety is our number one priority," he said. "We did a very thorough and complete inspection of all the operating systems... Everything was operating properly. We're confident the ride will continue to operate safely and properly."
Two people were treated for minor injuries in the park's first aid station and were later released.
A third person sent to Firelands Regional Medical Center for asthma-related problems was released later that afternoon, Innes said.
The hospital would not confirm the person's condition.