Washington Constitution Art. 12, § 13. Common Carriers, Regulation of

All railroad, canal and other transportation companies are declared to be common carriers and subject to legislative control.  Any association or corporation organized for the purpose, under the laws of this state, shall have the right to connect at the state line with railroads of other states.  Every railroad company shall have the right with its road, whether the same be now constructed or may hereafter be constructed, to intersect, cross or connect with any other railroad, and when such railroads are of the same or similar gauge they shall at all crossings and at all points, where a railroad shall begin or terminate at or near any other railroad, form proper connections so that the cars of any such railroad companies may be speedily transferred from one railroad to another.  All railroad companies shall receive and transport each the other's passengers, tonnage and cars without delay or discrimination.