The Port Jervis Line is a predominantly single-track commuter rail line running between Suffern and Port Jervis, in the U.S. state of New York. At Suffern, the line continues south into New Jersey as NJ Transit's Main Line. The line is operated by NJ Transit Rail Operations under a working agreement with Metro-North Railroad (MNRR). The line runs through some of the most remote and rural country found on the Metro-North system, and includes both its longest bridge, the Moodna Viaduct, and longest tunnel, the Otisville Tunnel.