Access to the Region's Core (ARC) was a proposed commuter-rail project to increase passenger service capacity on New Jersey Transit (NJT) between Secaucus Junction in New Jersey and Manhattan in New York City. New infrastructure would have included new trackage, a new rail yard, and a tunnel under the Hudson River. A new station adjacent to New York Penn Station was to be constructed as running more trains into the current station was deemed unfeasible. An estimated budget for the project was $8.7 billion. Construction began in mid-2009 and the project was slated for completion in 2018, but it was cancelled in October 2010 by Chris Christie, the governor of New Jersey, who cited the possibility of cost overruns and the state's lack of funds. Six hundred million dollars had been spent on the project. The decision remains controversial.

Secaucus Junction is an intermodal transit hub operated by New Jersey Transit in Secaucus, New Jersey. It is one of the busiest railway stations in North America.