Crossing the GTR main line, the Coteau and Province Line Railway and Bridge Company (C&PL) ran southeast, bridging the St. Lawrence River to reach Valleyfield where it crossed the original Beauharnois Canal at a lock, thence across southwestern Quebec to Cantic and then crossing the northern end of Lake Champlain between Alburgh and Swanton where it ended at a connection with the Central Vermont Railway (CVR).
The Coteau and Province Line Railway and Bridge Company (C&PL) traversed from the GTR main line southeast, crossing the St. Lawrence River to reach Valleyfield where it crossed the Beauharnois Canal at a lock, then continuing through southwestern Quebec to Cantic before crossing Lake Champlain between Alburgh and Swanton, finally connecting with the Central Vermont Railway (CVR).