The launch cable (the part that makes the train move fast) snapped inuring two people. Here you can see a video of it! (Don’t worry, it’s not gruesome.)
Big Dipper, Pleasure Beach Blackpool, UK
Two coaster trains collided inuring 21 people. Source
Formule 1, Parc Saint Paul, France
A 35-year-old woman died of a heart attack after being ejected from a car and falling 16 feet to the ground. Source (in French)
Firehawk, Kings Island, Ohio, USA
A man died from an undiagnosed medical condition after riding the coaster.
Monorail, Disney World, Florida, USA
Two trains collided head on killing one of the drivers and inuring several others. The video below contains distressing images.
Dueling Dragons, Islands of Adventure, Florida, USA
A worker was hit by an oncoming train. He survived and the park ended up being fined.
Holiday World, Indiana, USA
A filter pump malfunction in a water ride caused fumes that sent 42 people to a hospital with breathing troubles.
Go Gator, Travelling Funfair, UK
A 2-year-old was killed in an accident on the kiddie coaster.
Tomahawk, PortAventura, Spain
A 55-year-old worker died when he was run over by the coaster train. Source
DJ Jump, Travelling Funfair, UK
An 11-year-old girl was throw from the ride after the restraint opened, suffering a large head wound. The seat belt that could have prevented the incident was so poorly maintained as to be unusable.