Probably 1967, when the Aldene plan went into effect, if you are familiar with that. If you are not, basically, at Aldene (in Roselle Park, NJ, where the LV crosses over the CNJ), CNJ eastbound trains went up a new ramp to the LV, took the LV a few miles to just north of Newark airport, and then got on the PRR and went to Newark PRR Penn Station as the "end of the line".
The CNJ main east of Aldene (including the bridge over Newark Bay which was in bad shape, and the Communipaw station and the ferries to NY) and the Newark & NY, including the CNJ Newark Broad St station were all abandoned.
There are plans I think to turn that bridge into a pedestrian walkway (and maybe with stairs directly down to the Penn Station platforms), and turn that whole region between the Prudential Center and the PRR into a park. We'll see.
Ha Ha! I just looked back at the subchat thread link I found on Google and posted, and you were the one who started that thread in 2017!