Sarnia Subdivision
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The Sarnia Subdivision is a railroad line owned by the Lake Erie and Detroit River Railway[1] and operated by CSX Transportation in the Canadian province of Ontario. The line runs from Chatham north to Sarnia[2] along a former Pere Marquette Railway line. From its north end, CSX has trackage rights west over the Canadian National Railway's Strathroy Subdivision (through the St. Clair Tunnel) and the Grand Trunk Western Railroad's Flint Subdivision to the CSX Port Huron Subdivision near Port Huron, Michigan, and the Saginaw Subdivision in Flint.