Wash. Rev. Code § 81.36.030
Every corporation formed under the laws of this state for the construction of a railroad shall have the power to cross, intersect, join and unite its railway with any other railway before constructed, at any point in its route, and upon the grounds of such other railway company, with the necessary turn-outs, sidings, switches and other conveniences in furtherance of the objects of its connections, and every corporation whose railway is or shall be hereafter intersected by any new railway shall unite with the corporation owning such new railway in forming such intersections and connections and grant the facilities aforesaid; and if the two corporations cannot agree upon the amount of compensation to be made therefor, or the points and manner of such crossings and connections, the same shall be ascertained and determined in the manner provided by law for the taking of lands and other property which shall be necessary for the construction of its road, and every corporation formed under the laws of this state for the construction of a canal shall have the power to cross and intersect any railway before constructed at any point in its road and upon the grounds of such other railway company, and every corporation whose railway is or shall hereafter be crossed or intersected by any canal shall unite with the corporation owning such canal in forming such crossings and intersections and grant the facilities therefor; and if the two corporations cannot agree upon the compensation to be made therefor, or the points and manner of such crossings and connections, the same shall be ascertained and determined in the manner provided by law for the taking of lands and other property which shall be necessary for the construction of said canal.
RCW 81.36.030