law: Railways Act, 1989
  199. Rules to be laid before Parliament. 
  Every rule made under this Act shall be laid, as soon as may be
  
  after it is made, before each House of Parliament, while it is in session, for
  
  a total period of thirty days which may be comprised in one session or in two
  
  or more successive sessions, and if, before the expiry of the session
  
  immediately following the session or the successive sessions aforesaid, both
  
  Houses agree in making any modification in the rule or both houses agree that
  
  the rule should not be made, the rule shall thereafter have effect only in such
  
  modified form or be of no effect, as the case may be; so, however, that any
  
  such modification or annulment shall be without prejudice to the validity of
  
  anything previously done under that rule.