Now we are in the entrance to the Underworld. This is a past part of Grand Central Station that is no longer in use and was abandoned, but you can still venture down to Track 61 at your own risk. To get into the Underworld from here, you need to give your golden bough to Charon. In Jack's case, he had to give his subway token to a hobo. The golden bough is different for everyone; for Jack's dad, it was a bone.
Charon : https://c2.staticflickr.com/4/3553/3453012969_984f9c50fd.jpg