Mountain Avenue is an active commuter railroad station in the township of Montclair, Essex County, New Jersey. Serving trains of NJ Transit's Montclair–Boonton Line, Mountain Avenue is one of six stops in the municipality. The next station to the south/east is Upper Montclair. The next station to the north/west is Montclair Heights. Mountain Avenue contains two low-level side platforms. The station depot built by the Erie Railroad stands on the inbound platform, offering a waiting room for commuters. Part of the depot is also leased by the municipality for a residence.