With all the postings regarding monitoring of NJTransit buses, the following information should be of assistance in identifying who is communicating.
Buses operated directly by NJTransit Bus Operations (NJTBO) use the following frequencies:
Buses assigned to North Jersey garages (Oradell, Market Street, Wayne, Fairview, Meadowlands, Greenville, Ironbound, Hilton, Howell Twp., Orange, Big Tree):
856-860.2375 (5 frequencies) &
856-860.4875 (5 frequencies)
Buses assigned to South Jersey garages (Hamilton, Newton Avenue, Washington Twp., Egg Harbor Twp.):
857.3875
859.3875
This system operates as a non-trunked system (duplex). The radio transmissions from the buses do not go through a repeater, therefore it is necessary to include the mobile frequency (811-815) in your scanner. If you hear a transmission on the moblie frequency, you're near the transmitting unit.
NJTBO road supervisors and the three Light Rail systems (Newark, Hudson-Bergen and River Line) do not use this system. They and some of the other bus companies in New Jersey (not all companies) use the "other" system.
North Jersey 866 - .0125, .4625, .4875, .5125, .9625, .9875
867 - .0125, .4625, .4875,. 5125, .8625, .9875
868 - .0125, .4625, .4875
South Jersey 856.3875
858.3875
860.9875
Note: The frequencies used in South Jersey are also used by New York City Transit buses.
Regarding the question of the NJT Police using the trunked system, they use talk groups 09xxx.
Hope this information helps answer some questions