Mount Arlington is a commuter railroad station for New Jersey Transit. Located in the borough of Mount Arlington, Morris County, New Jersey, United States, the station is located next to interchange 30 on Interstate 80. The station serves as a park-and-ride for commuters to catch trains for Hoboken Terminal and New York Penn Station. Trains use the Montclair-Boonton Line and Morristown Line to serve locales between Hackettstown and the eastern terminals. Lakeland Bus Lines also services Mount Arlington station. The station is handicapped accessible as part of the Americans with Disabilities Act of 1990. The station features two side platforms and two tracks with elevators.

NJ Transit Rail Operations is the rail division of NJ Transit. It operates commuter rail service in New Jersey, with most service centered on transportation to and from New York City, Hoboken, and Newark. NJ Transit also operates rail service in Orange and Rockland counties in New York under contract to Metro-North Railroad. The commuter rail lines saw 57,179,000 riders in 2023, making it the third-busiest commuter railroad in North America and the longest commuter rail system in North America by route length.