Twenty-one riders on the roller coaster were hurt, with three taken to the hospital, though none critical.
Around 32 people were rescued from the two trains by emergency services, including a specialist rope rescue team.
The Big Dipper is one of the popular British amusement park's wooden roller coasters. It appears that one train became stuck on the track, then was hit by the other train.
The second train crashed into the first and rolled backwards down the slope to come to rest outside the Big Blue Hotel
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