The Ontario Northland Railway main line is a railway line in the province of Ontario, in Canada. It runs 438 miles (705 km) from North Bay, Ontario, to Moosonee, on the southern end of James Bay. The line was built in stages by the Temiskaming and Northern Ontario Railway, a crown corporation, between 1902 and 1932. The company was renamed the Ontario Northland Railway in 1946, and continues to own and operate the line. The Polar Bear Express provides passenger service between Cochrane, Ontario, and Moosonee. The Ontario Northland plans to resume passenger service south of Cochrane in 2026.