law: Railways Act, 1989
  166. Defacing public notices.
  If any person without lawful authority- 
  (a) pulls down or willfully damage any board or document set up
  
  or posted by the order of a railway administration on a railway or any rolling
  
  stock; or 
  (b) obliterates or alters any letters or figures upon any such
  
  board or document or upon any rolling stock, he shall be punishable with
  
  imprisonment for a term which may extend to one month, or with fine which may
  
  extend to five hundred rupees, or with both.