Which one of the following relates to the percussion theory for explaining the causes of creep?

- 1
  
  Pushing the rails forward and backward during starting and slowing
- 2
  
  Impact of wheels at the rail end abead at joints
- 3
  
  Pushing the rail off the track due to the thrust on driving wheels
- 4
  
  Formation of vertical reverse curves behind and ahead of wheels

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