Plans call for upgrading aging bridges, power supply and signal systems between Trenton and New York City.
NJ Transit said Friday that replacement of Amtrak's 100-year-old Portal Bridge over the Hackensack River will be a critical component of the upgrades. Amtrak said Friday it supports the NJ Transit application.
The Portal Bridge is used by more than 300 NJ Transit trains each weekday. Officials say replacing it and adding a third track would eliminate a major source of delays for rail commuters in New Jersey.
The money would come from the High Speed Intercity Passenger Rail program.