Boundary Line

The Boundary Line is a 129.7 mile railway line of the British Columbia Railway (BC Rail) running from Midway on the Kettle Valley Line to Rossland via Grand Forks, where it connects with the Washington & British Columbia Railway's Washington & Great Northern Line and Phoenix Line, and via Castlegar, where it connects with the Slluqan Valley Line and the North Western Pacific Railroad's Kootenay & Pend Oreille Line. In addition, it connects with the North Fork Line at Cuprum and Westend, and there are several other connecting spur lines.

The Boundary Line is Line 50 of BC Rail's Kootenay Region.