4. Can a train move if the train doors or platform screen doors have not been closed? What safety precautions will be put in place if the train doors or platform screen doors become defective?
   
  Trains are designed to be unable to start when the train doors and platform screen doors (if installed) have not been confirmed closed, in order to protect passengers on board and at platforms. There may be occasions that the train doors and platform screen doors become defective and are unable to be closed. Under the circumstances, the railway corporation will arrange the defective doors to be rectified immediately or locked with appropriate notices posted on them for alerting passengers of the defects.
   
 

   
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