Originally Posted by Air
The PATH is a commuter train that goes from NJ to NYC. Stops in Journal Square, Hoboken and a few other spots in between. From Philly you'd have to go all the way up to the GWB and back down (adds about 30 miles or so).
Here is it is
And the 15 of the miles up to the GWB are crapola.
Another possibility is any of several ferries.