To Mark777:
I think one of the historians here (ie. Dave) would be better suited to answer your question about the tunnel . "see above"
I can tell you at the "old" Woodhaven Station, A little west of where the tunnel dumps into Dunton Interlocking, there are two tubes that turn to the south. This was the Rockaway Branch There was an interlocking here years ago. I was in the old tower, which still had the model board (track plan) for the interlocking. Also all the porcelin was still intact in the retsrooms. In one room, that stored food as a bomb shelter there was barrels of drinking water (rusted through) containers of crackers (think vacuum sealed cans resembling nestle Quick cans, only larger) fresh as could be. This stuff I saw with my own eyes. Rumor has it from the old timers that was also chocalets in there that tasted swell. At the tubes I mentioned the old-timers told me there was an engine behind the sealed wall. I have been to several spots
Word of advice to all: THIS AREA IS HEAVILY ALARMED. Do not try to gain access or you WILL go to jail.