Last night I heard a unit on that talkgroup call in a stop on Route 78 to Hamilton Dispatch. I couldn't figure out who the agency is though. I'll keep an eye on it.
This sounds like its a combination of NJSP & PASP units patrolling the bridges. I have heard several stops and all have been within a mile of one of the bridges (Route 78, 22 or 80 crossings). I've heard a "Belfast 2" unit on several occasions, which I believe is a PA unit (PASP Troop M).
I was able to confirm last night that 36048 is B2-13, Bridge details. Hamilton Station Dispatches the units. I don't know about Troop C, but if they are doing the same thing on Troop A, the talkgroup should be 35216
I remember a news item about 4-6 months ago that said that the NJSP was going to assume some of the responsiblity for patrolling certain Penna./ NJ bridges, so this might be the start of that.