The Greenwich and Johnsonville Railway (reporting mark GJ) was a railroad in Upstate New York. It was founded in 1866 to construct a line from Greenwich to Johnsonville. The line opened in 1870.

The Rome, Watertown and Ogdensburg Railroad was a railroad that grew, in stages, from Rome, New York to Watertown and then to Ogdensburg, New York and Massena, New York.