Can the NJT multilevel’s fit on the upper level of GCT?
That would depend in part if the overhead third rail that used to be in place over the double-slip switches is still there.
More important question: How would NJT equipment even get to GCT?[*-)]
The third rail overhang, the overhead third rail (if it still exists), signals and signal bridges. There are a lot of tight squeezes down there. Although the trainshed themselves are roomy, the tunnels and entrances aren’t. Would need a good size shoe horn or shoe trees to make it happen and not need a stiff drink!
KInda shows and tells the story…