An excellent example of this is the New York & Greenwood Lake line, built as in independent railroad linking New York City with a remnant glacial tarn in the Catskills. Eventually acquired by the Erie Railroad, it was an active commuter line until 1982, and part of it has been repurposed into the Montclair-Boonton Line. But part of the ROW is lost--at the bottom of a reservoir, in fact.
This is an excellent example of viable disused passenger rail in North Jersey.
