The southbound K line is in development since this summer it's a rename of H line since the H line runs in the Rockaways.
K will start 55th Street/10th Avenue then curve south on 8th Avenue then run along the A line to Chambers St then curve southwest to Hudson River and passes under Ellis Island then it goes Elevated 1 mile before curve south on Broadway in Bayonne NJ then goes back underground to crosses Kill Van kull River to Staten Island then it goes elevated again on Richmond Terrace and Jewett Av then continues on Jewett Ave and continues Bradley Ave after it crosses Victory Blvd then Bradley Ave becomes Brielle Ave and routes ends at Forest Hill Road in New Springfield, Staten island.
the section south of Bowling Green to Forest Hill Road will be 3 tracks.