Where a person loads goods in a wagon beyond its permissible carrying capacity as exhibited under sub-section (2) or sub-section (3), or notified under sub-section (4), of section 72, a railway administration may, in addition to the freight and other charges, recover from the consignor, the consignee or the endorsee, as the case may be, charges by way of penalty at such rates, as may be prescribed, before the delivery of the goods:
     Provided that it shall be lawful for the railway administration to unload the goods loaded beyond the capacity of the wagon, if detected at the forwarding station or at any place before the destination station and to recover the cost of such unloading and any charge for the detention of any wagon on this account.