New Jersey’s transit authority has urged commuters heading to Manhattan to work from home if possible for up to a month. This is because of a major railroad upgrade starting Tuesday morning. Amtrak is moving some train traffic to a new bridge in a project expected to last until March 15. The work will cause big delays and fewer trains crossing the Hudson River. The $16 billion Gateway infrastructure project will replace the old 116-year-old Portal Bridge over the Hackensack River. About 200,000 people use this bridge daily, part of Amtrak’s busy Northeast Corridor rail line. Weekday trains will be cut from 332 to 178 to allow crews to finish the work and start using the new Portal North Bridge. Some trains normally bound for Midtown Manhattan will go instead to Hoboken, New Jersey. The old bridge has long problems like fires and drawbridge failures. NJ Transit CEO Kris Kolluri told ABC 7 News, "The Portal Bridge has been a nemesis and a nightmare for decades for riders on the Northeast Corridor," but said, "In the end there will be a brand new bridge for the first time in 116 years." Riders can also take the PATH train to New York City, but more demand is expected for that service. Transit officials suggest working from home if possible. The Gateway Project also includes building a new commuter rail tunnel under the Hudson River and fixing an old tunnel damaged by Hurricane Sandy in 2012. President Donald Trump has repeatedly tried to block federal funding for Gateway. A judge recently reversed a funding freeze amid reports Trump wanted Penn Station and Dulles Airport named after him. On Monday, Trump criticized the project again on social media, calling it a "boondoggle" that will cost billions more than expected. He warned of "financially catastrophic" impacts without "hard work and proper planning." Supporters say the project will create 20,000 jobs. The federal government released some funds after the court ruling, but another freeze could cause delays and job losses.