law: Railways Act, 1989
  194. Presumption where notice is served by post. 
  Where a notice or other document is served by post, it shall be
  
  deemed to have been served at the time when the letter containing it would be
  
  delivered in the ordinary course of post, and in proving such service, it shall
  
  be sufficient to prove that the letter containing the notice or other document
  
  was properly addressed and registered.