What happened?

• At 13:00 BST there was a problem with one of the trains so engineers were called in
• An empty test train was sent out but stalled out of sight of the engineers
• A train with 16 passengers on was then sent out
• The computer system halted the ride due to the stalled train
• Engineers believed this to be an error as they could not see the stalled train; there was a mistrust of fault signals
• They manually overrode the computer system
• This set the 16-passenger train in motion and into the empty carriage

Barrister Bernard Thorogood, prosecuting for the Health and Safety Executive (HSE), said the crash equated to: A family car of 1.5 tons colliding at about 90mph