law: Sale of Goods Act, 1930
  52. How stoppage in transit is effected
  (1) The unpaid seller may exercise his right of stoppage in
  
  transit either by taking actual possession of the goods, or by giving notice of
  
  his claim to the carrier or other bailee in whose possession the goods are.
  
  Such notice may be given either to the person in actual possession of the goods
  
  or to his principal. In the latter case the notice, to be effectual, shall be
  
  given at such time and in such circumstances, that the principal, by the
  
  exercise of reasonable diligence, may communicate it to his servant or agent in
  
  time to prevent a delivery to the buyer.
  (2) When notice of stoppage in transit is given by the seller to
  
  the carrier or other bailee in possession of the goods, he shall re-deliver the
  
  goods to, or according to the directions of, the seller. The expenses of such
  
  re-delivery shall be borne by the seller.