I live on the Northeast Corridor between Levittown and Bristol train stations, south of Trenton, your primary frequencies are 161.295 for the police and it depends on what pl tone used, mine is pl 100.0, which is the Trenton repeater, actually located in Morrisville PA across the river, the road channel south of Grundy interlocking is 160.92 and north of Grundy interlocking which is just south of Trenton is 161.01. There are mow and a low watt on board frequency used for train use only between conductor and engineer and trainman.
If you notice site one and two are on the Northeast Corridor site 1 is Rawn Street which is the address of Holmesburg Junction, that's a location that is a SEPTA train station but all external, and a interlocking and several sidings, where a lot of Amtrak rail repair equipment is stored. There's a large unused structure that was Holmesburg Junction tower.
None of the tower buildings are used anymore on the northeast Corridor between Philadelphia and Trenton.
Site 2 is the Trenton Transportation Center which is a pretty good size internal train station that is no longer operated by Amtrak, however it is a major Amtrak hub. It is operated by New Jersey Transit rail system including support staff, Station Master, police ect. Local New Jersey Transit trains operating from New York and Trenton meet SEPTA Regional Rail trains that travel from Trenton and Philadelphia.
The other two sites are on the Harrisburg line of Amtrak.
Can't confirm the use of these frequencies because I never tried but I will put them in a radio and listen. Maybe they aren't vocal frequencies and are used for some automated use..
Let you know if I hear anything.
