Towards the end of Fremont Tower the LI was contracted to staff the tower, and I had worked with a couple of guys that worked it. It was a real sleeper, only a few trains for one open tour. One guy recounted that it was one of the few jobs where the operator used a power panel (not done on LI, that was ET's work) and talked to the NH load dispatcher at Cos Cob along with their train dispatcher. He recalled having to deal with the power from a sub partway up towards Hellgate called Bowery Bay, and then dealt with the ones south of Fremont, which were fed with a sub just south of the ENY tunnels, with other subs at "college" (which also had a remote interlocking at one point also) and at the end of the branch at bay ridge. Those were fed from ConEd to that big substation just south of the tunnels. That sub may have fed into both the LI and the subway at one time, it's huge. At that time the NH ran straight through and the LI was used to do local service, their track was the western most tunnel and ran to New Lots as a secondary track. Forgot what he said occurred after that.
While there was problems with kids and the wire (still occurs rarely in CT, remember a kid from a nearby town doing it after a GDead concert in the '80s), the main reason the PC killed it was part of the plan to stop floating from Bay Ridge. Why float when you can go up the Hudson and down the other shore, with the resulting mileage. The second the PC could wiggle out of the contract the the LI the tower was immediately closed and interchange went to Fremont (now a yard) and the freight clerk at Pond controlled the branch south of Fremont after that. It was a tough job according to a conductor who once worked down there and he didn't have many happy memories, "war zone" was frequently used, especially for the work at night. The tracks were in bad shape back then, and no one was cleaning up the rampant dumping that was going on back then.