![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/1/10/HONEYWELL_STREET_BRIDGE_AND_ELEVATED_SUBWAY_BRIDGE_CROSSING_SUNNYSIDE_YARDS._LONG_ISLAND_CITY%252C_QUEENS_CO.%252C_NY._Sec._1411%252C_MP_3.55._-_Northeast_Railroad_Corridor%252C_Amtrak_Route_HAER_NY%252C31-NEYO%252C167-3.tif/lossy-page1-640px-thumbnail.tif.jpg&w=640&q=50)
Harold Interlocking
Railroad junction in New York City / From Wikipedia, the free encyclopedia
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Harold Interlocking is a large railroad junction located in New York City. It is the busiest rail junction in the United States.[1] It serves trains on Amtrak's Northeast Corridor and the Long Island Rail Road's Main Line and Port Washington Branch, which diverge at the junction.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/10/HONEYWELL_STREET_BRIDGE_AND_ELEVATED_SUBWAY_BRIDGE_CROSSING_SUNNYSIDE_YARDS._LONG_ISLAND_CITY%2C_QUEENS_CO.%2C_NY._Sec._1411%2C_MP_3.55._-_Northeast_Railroad_Corridor%2C_Amtrak_Route_HAER_NY%2C31-NEYO%2C167-3.tif/lossy-page1-640px-thumbnail.tif.jpg)
Reconstruction work on Harold Interlocking started in 2009, as part of the East Side Access project to bring LIRR service to a new station under Grand Central Terminal. As part of the project, two tunnels for Northeast Corridor trains to bypass Harold Interlocking were built to address congestion problems and occasional accidents.