I explored the NJLB quite a bit in 1992 when work took me to the area. The catenary was still in the whole way and looked in perfect shape. This was before internet/google maps mind you, so I didn't know where I was. Well, I ended up in the coal yards at South Amboy where the coal classification was done. There were approx 12 tracks still in across the yard area, all with overhead catenary. It was like a jungle of wire above those tracks. Only a single track was still in use all the way to the north part of the yard. All the warning signs (high wire/low wire), yard lights, and other interesting things were still in place but rusted solid. It looked like a post apocolyptic wasteland. The yards closed in the mid-1960s and that means for 35 years that yard sat there derelict.
The current road bridge that is labled as Radford Ferry Rd on google maps, next to the single RR track, held 5 tracks with catenary above it. It was being used by dump trucks to access the sand pits and the tracks were burried. I think this is how locos got to the diesel hold up area.
I think CR tore out the yard tracks and caternary in the late 90s early 2000s. Really don't know what the point of this was why not just leave the wire up and energize if needed.