Just days before commuters’ public transportation routines are set to be disrupted, the U.S. Department of Transportation has approved a multimillion-dollar loan for improvements to New York’s Penn Station.

The loan for more than $500 million will help improve Penn Station in Manhattan. The money will help shift Amtrak trains to a new train hall in the Farley Post Office Building across from the existing Penn Station.

The project is expected to relieve congestion at Penn Station, but it won't be done until 2020. Meanwhile, repairs get underway on Monday, forcing thousands of New Jersey Transit riders to change their schedules.

The work comes after several delays and train derailments at Penn Station this year. 

NJ Transit is urging all Morris and Essex Line customers to check for new schedules, train times and stops.

Midtown Direct trains on the Gladstone Branch will be diverted to and from Hoboken.

Midtown Direct trains on the Montclair-Boonton Line will operate with minor time changes to and from New York Penn Station, as well as the Northeast Corridor trains.

Hoboken-bound North Jersey Coast Line trains will end at Newark Penn Station.

For more details and updates over the course of the repairs, visit News 12’s Commuter Chaos section.