National Docks Secondary is a freight rail line within Conrail's North Jersey Shared Assets Area in Hudson County, New Jersey, used by CSX Transportation. It provides access for the national rail network to maritime, industrial, and distribution facilities at Port Jersey, the Military Ocean Terminal at Bayonne (MOTBY), and Constable Hook as well as carfloat operations at Greenville Yard. The line is an important component in the planned expansion of facilities in the Port of New York and New Jersey. The single track right of way comprises rail beds, viaducts, bridges, and tunnels originally developed at the end of the 19th century by competing railroads. Route The line is used to access the port at the Upper New York Bay, which lies east of those crossing the Northeast Corridor. It runs parallel to the New Jersey Turnpike Newark Bay Extension for most of its length and passes through a cut in the Hudson Palisades. It travels north-south on the east side of Bergen Hill and through a short tunnel crossing beneath the PATH rapid transit system. At its southern end trains cross Newark Bay over the Lehigh Valley Railroad Bridge to the Oak Island Yard in Newark. At is northern end the line travels through Bergen Hill via the Long Dock Tunnel and after passing under Tonnelle Avenue junctions with the Northern Running Track. At North Bergen Yard, the line becomes the River Subdivision. It is an alternate, or secondary, route to the Passaic and Harsimus Line across the Kearny Meadows for trains passing through the Port of New York and New Jersey. As of June 2018, Crossing updated and expanded at Chapel Avenue and siding tracks have been added between Linden Avenue and Liberty State Park. Renewal and expansion of port The National Docks Secondary is an integral component in the anticipated expansion of the Liberty Corridor and Cross Harbor Freight Movement projects, including the intermodal container transhipment operations on the west side of the Upper New York Bay in the Port of New York and New Jersey. To that end, as of 2010, the track is being restored, tunnel clearances increased, and redundant overhead bridges removed to allow double stacking of the high-cube containers increasingly favored for intermodal transportation. The line will connect with ExpressRail Port Jersey, a ship-to-rail container transfer operation, planned to open in 2014, and to the planned new post-Panamax container terminal at MOTBY. History