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.

Immediately after leaving Hoboken, the route passes the coach and diesel yards before entering the 1908 Bergen Tunnels under the New Jersey Palisades just past the East End interlocking.

It enters the newly renovated Newark Broad Street station, which features two high platforms serving all three tracks.

After passing the abandoned station at Grove Street, now the location of Green interlocking, the line crosses the Garden State Parkway and reaches East Orange, which is situated on a viaduct.

West of Summit, the Gladstone Branch diverges, and the line crosses the Passaic River for the second time as it enters into Chatham Township.

The station is a focal point of a new transit-oriented development, featuring ADA-compliant mini-high platform ramps at both ends.

Beyond Morris Plains, the line curves through wooded areas, passing beneath Route 10, and several crossings before reaching Mount Tabor station, a small stop in Denville Township near the community of the same name in Parsippany.

The Morristown Line's catenary wires end approximately half a mile west of Dover station near the U.S. Route 46 (US 46) overpass.

There are unfunded plans[citation needed] to extend electric service to Lake Hopatcong, as the Dover Yard is at capacity and Wharton's substation has been operational since 1984.

Continuing westward, two tracks extend over the Rockaway River, passing D&R Junction in Wharton, where the Dover-Rockaway Branch of Morris County diverges.

Mount Arlington park-and-ride station follows, with dual high platforms and 285 parking spaces near Exit 30 on Interstate 80 (I-80).

The Lackawanna Cutoff connects on the right as the train approaches Port Morris Yard, which houses the diesel fleet serving both the Montclair-Boonton and Morristown lines.

Crossing beneath I-80 again, the line enters the Mount Olive International Trade Center, where a station is positioned at Waterloo Valley Road.

The track beyond Hackettstown falls under the ownership of Norfolk Southern Railway and is operated by the Dover & Delaware River Railroad as part of the Washington Secondary extending to Phillipsburg.

Future plans contemplate extending rail services into northeastern Pennsylvania, potentially reaching as far as Scranton.

The Morristown Line east of Dover station is electrified, using 25 kV, 60 Hz AC overhead catenary wire.