1. What is "brake jam" or "brake hanging"? Why does it not affect safety?
   
  "Brake jam" or "brake hanging" occurs when a brake is unable to be released from a wheel of train. The brake pad will be rubbing against the rotating braking disc or wheel, which will generate heat as well as some smoke and burning smell. This does not pose any safety risks and the train is still able to move. Under the circumstance, the railway corporation will arrange detrainment of passengers at a station and return of the train to depot for rectifications.
   
 

   
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