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