The US state of New Jersey's public transportation corporation, NJ Transit, has sought $885m in federal funding for key infrastructure improvements on the Northeast Corridor rail line.
The plan includes upgrading aging bridges, power supplies and signal systems between Trenton and New York City.
The upgrades include the replacement of Amtrak's 100-year-old portal bridge between Newark and New York Penn station and the expansion of rail capacity over the Hackensack River.
Amtrak said it supports the NJ Transit application, which will improve the movement of passenger trains on the Northeast Corridor, the busiest passenger rail line in North America.
The state of New Jersey is seeking funding from the 2010 High-Speed Intercity Passenger Rail programme under the Trenton-to-New York service development programme.