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.