Mr. Moderator?
To answer the original question...155.820 is used by the NYS Office of Parks, Recreation, and Historical Preservation's Long Island State Park and Recreation Commission as a maintenance channel, under call sign KRP804. I can not confirm the PL, but 123.0 is used on the (LI) State Park Police channel.
To answer the very off-topic question...It is unlikely that a scannist in New York City will be able to hear radio traffic from Trenton. The only unlikely way I could think of is if there is an authorized Troop A area unit on the SPNJ trunked system affiliated on the Troop C (or B) system.