Southern Tier Line

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. A mostly former Erie Railroad line, it is suggested that the line runs from Suffern, New York northwest to Buffalo, New York as it shares trackage with Metro-North Railroad’s Port Jervis Line from Suffern to Port Jervis; NS owns the Suffern to Port Jervis trackage and leases it to Metro-North so it can maintain it for its Port Jervis Line passenger operation. 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.

From Port Jervis to Binghamton, the line is leased to and maintained by the Central New York Railroad, part of the Delaware Otsego Corporation. It junctions with the Lake Erie District at its west end. Along the way it meets the Corning Secondary at Corning, New York.