The Canadian Constitution clearly gives absolute power over inter-provincial trade (Section 92[a]) to the federal government ― not B.C..
From a more fundamental point of view, the common interest binding people into countries is economics. We share (trade) among each other for the common good.
B.C.’s precedent setting action means Alberta can toll (tax) every rail car to and from B.C.; every truck to and from B.C.; every air plane to and from B.C..
Where does it stop?