(a)
(1) Cars detained or held at the point of shipment for want of proper shipping instructions or by reason of imperfect or excessive loading when the loading is done by the shipper shall be subject to a demurrage charge of five dollars ($5.00) per car per day or fraction of a day the cars are so detained or held.
(2) In case of imperfect or excessive loading, the shipper shall be notified thereof as early as practicable after the cars have been received from him or her, in which case, car service charges shall begin at the time of notification.
(b) No demurrage charge provided in this section shall be collected by the railroad company after the car has been removed from the point of shipment.