The Southern Tier Line is a railroad line owned and operated by the Norfolk Southern Railway in the U.S. states of New York and Pennsylvania. The line runs from Suffern, New York northwest to Buffalo, New York mostly along a former Erie Railroad line. From Suffern to Port Jervis along which passenger service still runs, the line is leased to and maintained by Metro-North Railroad for its Port Jervis Line. From its east end, NS has trackage rights south on the New Jersey Transit Main and Bergen County Lines to Conrail's North Jersey Shared Assets Area; it junctions with the Lake Erie District at its west end. Along the way it meets the Corning Secondary at Corning, New York.