The proposed "new" Sunnyside station from the maps that I have, show that the station will be served by trains heading into Penn station and not GCT trains, although a new LIRR yard would be built in the current A Yard to store equipment for GCT. The station location looks to be west of the overpass where Queens BLVD and No. 7 train pass over, by Harold interlocking. But the maps I have were from some years back, so I don't know if they changed it recently? A bit of progress can be seen already at the east end of Harold where Amtrak NH line meets with the LIRR, but digging for the portals that will meet with the mainline at Harold havent been started yet.