law: Railways Act, 1989
  78. Power to measure, weigh, etc.  
  Notwithstanding anything contained in the railway receipt, the
  
  railway administration may, before the delivery of the consignment, have the right
  
  to- 
  (i) re-measure, re-weigh or re-classify any consignment;
  (ii) re-calculate the freight and other charges; and
  (iii) correct any other error or collect any amount that may
  
  have been omitted to be charged.