law: Railways Act, 1989
  141. Needlessly interfering with means of communication in
  
  a train. 
  If any passenger or any other person, without reasonable and
  
  sufficient cause, makes use of, or interferes with, any means provided by a
  
  railway administration in a train for communication between passengers and the
  
  railway servant in charge of the train, he shall be punishable with
  
  imprisonment for a term which may extend to one year, or with fine which may
  
  extend to one thousand rupees, or with both :
  Provided  that, in the absence of special and adequate
  
  reasons to the contrary to be mentioned in the judgment of the court, where a
  
  passenger, without reasonable and sufficient cause, makes use of the alarm
  
  chain provided by a railway administration, such punishment shall not be less
  
  than- 
  (a) a fine of five hundred rupees, in the case of conviction for
  
  the first offence ; and
  (b) imprisonment for three months in the case of conviction for
  
  the second or subsequent offence.