The BMT Sea Beach Line (N train) and the LIRR Bay Ridge Line
continue to run parallel to each other in a wide, shallow trench
through Sunset Park.
The Sea Beach Line (N train) station at Eighth Avenue would presumably
be also used by the Circumferential Line.
I was surprised to find that Brooklyn has it's own Chinatown here in
Sunset Park with lots of restaurants and retail along with light manufacturing
and distribution facilities.