Wyo. Stat. § 37-9-410: Additional charges for delay forbidden.

Any railroad company, operating within the state of Wyoming, and transporting commodities from a consignor to a consignee, within this state, shall not charge to either the consignor, or consignee of said commodities any additional sum of money, for freight or transportation, on account of any delay in the transportation or delivery of same, not caused by the direct act or agency of the said consignor or consignee.