law: Railways Act, 1989
  193. Service of notice, etc., by railway administration. 
  Unless otherwise provided in this Act or the rules framed
  
  thereunder, any notice or other document required or authorized by this Act to
  
  be served on any person by a railway administration may be served- 
  (a) by delivering it to the person; or
  (b) by leaving it at the usual or last known place of abode of
  
  the person; or
  (c) by registered post addressed to the person at his usual or
  
  last known place of abode.