Tsunami, M&Ds Scotland’s Theme Park, UK

Nine children and two adults were hospitalised after all five carriages on the Pinfari-manufactured coaster came off the tracks, plunging roughly 20 feet (6m) to the ground and hitting a child’s car ride, before coming to a rest upside down, leaving riders trapped. Source

Tsunam M&Ds Scotland's Theme Park Accident
Police with Health and Safety Executives investigate the incident.

Zippin Pippin, Bay Beach, Wisconsin, USA

One rider and two workers were injured when an occupied train failed to stop properly, hitting an empty train in the loading area, which in turn hit the workers. Source (with video report)

Zippin Pippin Bay Beach Wisconsin Accident
Fire truck at the scene of the incident.

Disco Dancer, Kishkinta Theme Park, Chennai, India

A 25-year-old man was killed and 10 others injured when employees were forced to test a Disk-O knockoff ride that came off the track and crashed to the ground. Source

King’s Crown, Cinco de Mayo Carnival, Nebraska, USA

An 11-year-old girl lost her scalp and fractured her skull on the spinning carnival ride when her hair got sucked into the ride’s machinery. Source (with video report)

Boomerang, Six Flags St. Louis, Missouri, USA

Four people received minor injuries after the coaster abruptly stopped mid-ride, with two cars de-railing off the track.  Source (with video report)

Boomerang Six Flags St. Louis Accident
Derailed car (fourth from the front).