tunnels will be constructed from the LIRR Mainline tracks in Queens,
under Amtrak's Sunnyside Yard and LIRR's Existing Rail
Yard, connecting to the existing 63rd Street Tunnel just beyond
Northern Blvd. In Manhattan, new tunnels will be bored from the
existing bellmouth structure at Second Avenue and 63rd Street, west
and then south, under Park Avenue and Metro-North Railroad's
four-track right of way.