Morristown Line

The Morristown Line is an NJ Transit commuter rail line connecting Morris and Essex counties to New York City, via New York Penn Station or Hoboken Terminal. It is one of the two routes that make up the Morris & Essex Lines, alongside the Gladstone Branch. Out of 52 inbound and 53 outbound daily weekday trains, 34 inbound and 37 outbound Midtown Direct trains (about 67%) use the Kearny Connection (opened June 10, 1996) to Penn Station, and the rest go to Hoboken. Passengers can transfer at Newark Broad Street or Summit to reach another destination. On rail system maps, the line is colored dark green, and its symbol is a drum, a reference to Morristown's history during the American Revolution.

As of February 3, 2025, the Morristown Line operates 105 trains (52 inbound, 53 outbound) on weekdays. Of these, 33 inbound trains originate from Dover, 5 from Hackettstown, 2 from Mount Olive, 1 from Lake Hopatcong, 10 from Summit, and 1 from Maplewood. 15 outbound trains terminate at Summit, 1 at Lake Hopatcong, 1 at Mount Olive, 4 at Hackettstown, and 32 at Dover. Stations east of Chatham are also served by Gladstone Branch trains throughout the day.

There is hourly service to/from New York (none going beyond Dover) on weekends. Until August 13, 2006, there was also hourly service to Hoboken. On that date, service between Hoboken and Summit was cut back to once every two hours on weekends. On May 11, 2008, off-peak weekday Hoboken-Dover trains (600 Series) were cut. In addition, weekend Gladstone trains were cut back to Summit, and a shuttle train is operated every two hours between Newark Broad Street and Hoboken Terminal.

The Millburn-Summit segment underwent extensive rehabilitation in the mid-2010s. This included the replacement of the creosote crossties on both tracks with concrete crossties, the replacement of all crossties on the double trestle over Short Hills Avenue, and the replacement of several sections of rail. Work has also progressed on rehabilitating both tracks between Summit and Dover with concrete crossties and new welded rail, and rehabilitation of select road overpasses.

Hurricane Sandy inflicted considerable damage on the Morristown Line on October 29–30, 2012, as fallen trees brought down catenary and signal wires and washed out sections of track, most notably through the New Jersey Meadowlands on both the main line and the Kearny Connection. Midtown Direct service was restored from Dover to New York on November 12, 2012; service to Hoboken and west of Dover resumed on November 19.