Until the opening of the 60th Street Tunnel Connection in 1955 after the unification of the subway, only express trains in Queens ran to Manhattan; local trains were routed onto the IND Crosstown Line.
Prior to the opening of the 60th Street Tunnel Connection in 1955, after the unification of the subway system, only express trains in Queens were able to reach Manhattan; local trains were directed onto the IND Crosstown Line.