The River Subdivision is a railroad line owned by CSX Transportation in the U.S. states of New Jersey and New York.

Prior to July 1, 2008, the section of track from QR 2.1 north to CP-QR 7, a point located in Bogota, New Jersey, was originally part of the CSX Bergen Subdivision / Baltimore Division[5] prior to 2008, while the River Subdivision began at CP-QR 7 and continued north to Selkirk.

Also taking place at this same time, was the River Subdivision being extended south to QR 1.6, adding 5/10th of a mile to the route.

The section of track south of QR 1.6 at the south end of North Bergen Yard is now owned by Conrail Shared Assets Operation (CSAO) and is part of the North New Jersey Operational Area River Line.

The Port Subdivision ends 7 miles north of CP-SK in South Albany, NY at the Kenwood Yard of the Canadian Pacific Railway.

Radio transmissions between trains and dispatcher operating upon the CSX River Subdivision is assigned to the CSX 'NI' Dispatcher Desk, and can be heard on the following frequencies: Also, if in close proximity to them, "Hot Box", High Wide "HIWI" or Defect Detectors can be heard relaying train info (speed, axle count, defects if any (hot boxes or dragging equipment) to the train on the aforementioned road channel.

[12] Plans have been proposed to add sidings and supersidings along portions of the River Subdivision, as rail traffic along this route has increased due to escalating fuel prices and deteriorating and/or congested arterial highways.

With the advent of Centralized Traffic Control a/k/a "CTC", the River line was reduced to single-track main with passing sidings at strategic locations.

2008) put forth plans to either install supersidings (multi-segment extended length sidings), permitting trains to pass one another at speed without stopping, or reverting to complete double-tracking from North Bergen to Selkirk.

While the Northern Branch Corridor Project has proceeded to the EIS Stage, the West Shore Route is still proposed.

Issues in starting commuter rail service are: With these considerable construction issues, as well as no available space in New York Penn Station for West Shore Line trains, this proposal was put on hold until capacity into New York is increased (with the completion of the proposed Gateway Tunnel).