Port Subdivision has a northern terminus at the port with facilities on both sides of what river?
Port Subdivision:  At its south end, the Port Subdivision junctions with the Castleton Subdivision and River Subdivision; its north end is at the Port of Albany, served by the Albany Port Railroad. Port of Albany–Rensselaer: The Port of Albany–Rensselaer, widely known as the Port of Albany, is a port of entry in the United States with facilities on both sides of the Hudson River in Albany and Rensselaer, New York.
Hudson