They are located in the Meadowlands in Kearny, New Jersey, between Newark Penn Station and Secaucus Junction at a stretch where the rights-of-way of Amtrak, NJ Transit, PATH, and Conrail converge and re-align.

At this stretch of the Northeast Corridor, the rights-of-way of Amtrak, NJ Transit, PATH, and Conrail converge, run parallel, and re-align.

[4] "Hudson Interlocking" (MP8.3) and the single track limited-use NJ Transit "Red Bridge", part of the Waterfront Connection, allows trains access to the NEC when travelling to or from Newark Penn in the west.

[5] The Sawtooth Bridges, considered a part of major bottleneck in the busiest section of the Northeast Corridor, are slated for replacement as part of the Gateway Program, an infrastructure improvement program along 10 miles of the rail line between Newark and New York.

[8] Initial stages of replacement of the nearby Portal Bridge over the Hackensack River began in 2019.