I wasn't on the job that day. I'd heard about when I was covering a Manville job. From what the guys said, it was kids from the local high school that derailed the train. They weren't positive but think it was when they were going from southern to freehold. Guys said the problems with kids throwing stuff on the tracks only started becoming a problem around split date. And no it wasn't gang related.
All the gang crap was in Lakewood anyways. None of that in Farmingdale at the time. Only other incident I know of from that time was about 1997 ish when some damaged cars were left on the siding at Marl Rd. Stayed there for a few days till Conrail came to replace the wheels.
Since then? I don’t think there was anything until the March 2022 derailment. Was there for that one, very scary to watch!