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A northbound stack train approaches Storm King Mountain on the River Subdivision.

The River Subdivision (also known as the River Sub or River SD) is a major north-south rail corridor located between North Bergen, New Jersey and Selkirk, New York, carries strictly freight trains and runs mostly along the shoreline or paralleling closely to the west bank of the Hudson River. The River Subdivision is part of the CSX Albany Division, which in turn is part of CSX's Northern Region of Operations.

The CSX designated subdivision code for the River Subdivision is "RI", with the River Subdivision falling under the "NI" dispatchers desk since March 8, 2009. It had been part of the "NJ" dispatchers desk until this date. Mileposts and locations along the River Subdivision are denoted by the CSX milepost prefix: "QR".