Wash. Rev. Code § 81.28.030
All common carriers subject to regulation by the commission as to rates and service and doing business wholly within this state shall, upon receipt of any article of freight, promptly forward the same to its marked destination, by the route directed by the shipper, or if no directions are given by shipper, then to any connecting company whose line or route reaches nearest to the point to which such freight is marked.
Any such common carrier failing to comply with this section is liable for any damages that may be sustained, either to the shipper or consignee, from any cause, upon proof that the damages resulted from a failure of the transportation company to comply with this section.
Suit for damages may be instituted either at the place of shipping or destination, either by the shipper or consignee, and before any court competent and qualified to hear and determine like causes between persons who reside in the court's district.
RCW 81.28.030