Four people have been taken to hospital and 25 others treated for cuts and bruises following an accident on the Runaway Mine Train at Alton Towers.
It happened when the front carriages of the train separated and rolled back into the rest of the train. The ride, which was full with 46 passengers at the time, was immediately evacuated and was closed to the public.
Two women, aged in their 30s or 40s, were flown by air ambulance to North Staffordshire Hospital suffering possible whiplash, spinal or abdominal injuries of the sort seen in car crashes, a Staffordshire Ambulance spokesman said.
A third woman was taken by land ambulance to the same hospital and a man is thought to have made his own way to a casualties centre in Leek. The rest were treated at a medical centre at the theme park.
Alton Towers and the Health and Safety Executive are investigating the crash. A spokeswoman said it was unclear how long the ride would be closed for. The rest of the theme park remains open.