The northern stub-end of the Camden & Amboy is being ripped up as well!
But don't panic, this time it's only temporary. You know how the tracks end just south of running under the NJ Turnpike? Well, the Turnpike is being widened, extended the truck lanes from Exit 8A to Exit 6. As such, every overpass and underpass along the way must be rebuilt or widened. (Note that the NJ-133 bridge was built to accommodate right from the start.) The bridge over the tracks, parallel to Hightstown-Cranbury Station Rd., is no exception. So the tracks are being ripped up, but will be rebuilt when the project is completed.
Look at the sixth picture from the left on this site:
http://www.njturnpikewidening.com/construction/701.html
The seventh pic shows what looks like a pile of crossties and some rail, but what exactly is happening is unclear.
I distinctly remember reading about the turnpike widening plans, and it specifically mentioned that the tracks under that bridge were indeed active, though currently not in use.