The Morris and Essex Railroad was a railroad across northern New Jersey, later part of the main line of the Delaware, Lackawanna and Western Railroad.
The Delaware, Lackawanna and Western Railroad leased the M&E on December 10, 1868, connecting to their Warren Railroad at Washington.
On July 26, 1945 the M&E was formally merged into the DL&W. However it remained the Morris and Essex Division, and even today New Jersey Transit calls it the Morris and Essex Lines. In 1960 the DL&W merged with the Erie Railroad to form the Erie-Lackawanna Railroad, becoming part of Conrail in 1976.