Part of a new infrastructure plan calls for upgrading service between Riverhead and Ronkonkoma by adding an electrified track. (Joe Werkmesiter photo) An ambitious proposal to bring “world-class” high-speed rail to the Northeast, including a 16-mile rail tunnel that would connect Long Island and Connecticut, could provide a critical boost to the East End with an upgraded electrified rail connecting Riverhead to Long Island Rail Road’s Ronkonkoma hub. A panel of officials from Suffolk County, Connecticut and Boston discussed the North Atlantic Rail Initiative during a webinar last week, where they pitched the $105 billion, three-phase project as “transformative” for the future of the region.