Harold Interlocking is a large railroad junction located in

New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...

. It is the busiest rail junction in the United States. It serves trains on

Amtrak The National Railroad Passenger Corporation, Trade name, doing business as Amtrak () , is the national Passenger train, passenger railroad company of the United States. It operates inter-city rail service in 46 of the 48 contiguous United Stat ...

's Northeast Corridor and the Long Island Rail Road's

Main Line Mainline, ''Main line'', or ''Main Line'' may refer to: Transportation Railway * Main line (railway), the principal artery of a railway system * Main line railway preservation, the practice of operating preserved trains on an operational railw ...

and

Port Washington Branch The Port Washington Branch is an electrified two-track rail line and service owned and operated by the Long Island Rail Road in the U.S. state of New York. It branches north from the Main Line at the former Winfield Junction station, just eas ...

, which diverge at the junction. Reconstruction work on Harold Interlocking started in 2009, as part of the

East Side Access East Side Access (ESA) is a public works project in New York City that extended the Long Island Rail Road (LIRR) from its Main Line in Queens into a new station under Grand Central Terminal on Manhattan's East Side. A project of the Metropol ...

project to bring LIRR service to Grand Central Terminal. As part of the project, two tunnels for Northeast Corridor trains to bypass Harold Interlocking are being built to address congestion problems and occasional accidents.

Location and operation

The junction is located in

Queens Queens is a borough of New York City, coextensive with Queens County, in the U.S. state of New York. Located on Long Island, it is the largest New York City borough by area. It is bordered by the borough of Brooklyn at the western tip of Long ...

, New York, east of the

East River Tunnels The East River Tunnels are four single-track railroad passenger service tunnels that extend from the eastern end of Pennsylvania Station under 32nd and 33rd Streets in Manhattan and cross the East River to Long Island City in Queens. The tracks ...

and next to Amtrak's and

NJ Transit Rail Operations NJ Transit Rail Operations is the rail division of NJ Transit. It operates commuter rail service in New Jersey, with most service centered on transportation to and from New York City, Hoboken, and Newark. NJ Transit also operates rail service ...

Sunnyside Yard Sunnyside Yard is a large coach yard, a railroad yard for passenger cars, in Sunnyside, Queens in New York City. Description The yard is owned by Amtrak and is also used by New Jersey Transit. The shared tracks of the Long Island Rail Road (LIR ...

. During the rush hour period, over 40 trains per hour pass through the

interlocking In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. The signalling appliances and tracks are sometimes collectively re ...

; and a total of 783 trains each weekday. In addition to Amtrak trains, the interlocking serves the Long Island Rail Road (LIRR), whose

and

diverge from the Northeast Corridor at Harold Interlocking. Harold Honeywell jeh

left, Entering the Harold Interlocking on the LIRR from the east The complexity of the junction and the large volume of traffic have caused frequent delays and occasional accidents in this portion of the Northeast Corridor.

History

The

Pennsylvania Railroad The Pennsylvania Railroad (reporting mark PRR), legal name The Pennsylvania Railroad Company also known as the "Pennsy", was an American Class I railroad that was established in 1846 and headquartered in Philadelphia, Pennsylvania. It was named ...

built the Harold Interlocking in 1908 as part of the

New York Tunnel Extension The New York Tunnel Extension (also New York Improvement and Tunnel Extension) is a combination of railroad tunnels and approaches from New Jersey and Long Island to Pennsylvania Station in Midtown Manhattan. It was built by Pennsylvania Railr ...

project, which built

Pennsylvania Station Pennsylvania Station (often abbreviated Penn Station) is a name applied by the Pennsylvania Railroad (PRR) to several of its grand passenger terminals. Several are still in active use by Amtrak and other transportation services; others have been ...

, the

North River Tunnels The North River Tunnels are a pair of rail tunnels that carry Amtrak and New Jersey Transit passenger lines under the Hudson River between Weehawken, New Jersey, and Pennsylvania Station in Manhattan, New York City, New York. Built between 1904 ...

(under the

Hudson River The Hudson River is a river that flows from north to south primarily through eastern New York. It originates in the Adirondack Mountains of Upstate New York and flows southward through the Hudson Valley to the New York Harbor between N ...

), the East River Tunnels and Sunnyside Yard. The interlocking was renovated in summer 1990 during a nine-week modernization project. This renovation was conducted several months after a power surge caused trains to be stuck in the interlocking. Since the 1990s, Harold Interlocking has been controlled from a tower at Penn Station.

East Side Access improvements

The

Metropolitan Transportation Authority The Metropolitan Transportation Authority (MTA) is a public benefit corporation responsible for public transportation in the New York City metropolitan area of the U.S. state of New York. The MTA is the largest public transit authority in th ...

(MTA) began construction of several infrastructure improvements to the junction area in 2009, but a major project to redesign and rebuild the interlocking required additional funding. In May 2011, a $294.7 million federal grant was awarded to address congestion at the interlocking. The work will allow for a grade-separated route between the

and the

Hell Gate Bridge The Hell Gate Bridge, originally the New York Connecting Railroad Bridge or the East River Arch Bridge, is a steel through arch railroad bridge in New York City. Originally built for four tracks, the bridge currently carries two tracks of Amtr ...

for Amtrak trains traveling to or from

New England New England is a region comprising six states in the Northeastern United States: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It is bordered by the state of New York to the west and by the Canadian provinces ...

, thus avoiding LIRR traffic. Northeast Corridor trains from the Hell Gate Bridge and New England would be able to avoid the junction entirely, while trains to the Hell Gate Bridge and New England would be able to bypass a major section of the junction. As part of the project, Amtrak's car-washing facility within Sunnyside Yard, as well as several small Amtrak buildings, are being relocated. The MTA is constructing and managing the improvement project as part of the adjacent

project to bring the LIRR to Grand Central Terminal. The MTA estimates that East Side Access will be substantially complete in 2022. , two of three East Side Access tunnel portals had been built at Harold Interlocking; the remaining portal had been completed by early 2021. Work on the Northeast Corridor bypass started in 2013. However, by October 2015, the tunnels were behind schedule because Amtrak and the MTA could not cooperate on track access schedules. These delays ultimately raised construction costs by almost $1 billion as of April 2018, and in a report that month, the MTA attributed the delays to a lack of cooperation on Amtrak's part. The work at Harold Interlocking also included the installation of a microprocessor-based interlocking logic, replacing the old relay-based one.

References

External links

Map of Harold Interlocking
- MTA
"Inside Sunnyside Yards, New York City's Next Megaproject"
– ny.curbed.com (February 19, 2015) {{Coord, 40.7485, N, 73.927, W, display=title Amtrak Rail junctions in the United States Rail transportation in New York City Long Island Rail Road NJ Transit Rail Operations Long Island City