The Pennsylvania Railroad built the Sawtooth Bridges, a pair of railroad bridges on the Northeast Corridor in the Meadowlands in Kearny, New Jersey, in the early 20th century.
The bridges — known as Amtrak Bridge No. 7.80 and Amtrak Bridge No. 7.96 — are located between Newark Penn Station and Secaucus Junction.
The rights-of-way of Amtrak, NJ Transit, PATH and Conrail converge and re-align in the vicinity.
As of 2023, the Sawtooth Bridges carry more than 400 Amtrak and N.J. Transit trains per day over tracks used by NJ TRANSIT, PATH and Conrail freight trains. The age and condition of the Sawtooth Bridges restrict trains to speeds of 60 mph.
The bridges are to be replaced as part of the Gateway Program, and when complete, the new four-track NEC structure will double track capacity.
