The track originates at Mount Pleasant Junction, where it diverges from the New Bedford Secondary, and runs through Dartmouth before terminating in north Westport.

After crossing the border, the track passes beneath Interstate 195 and continues for just over a mile, until passing beneath Massachusetts Route 88, at which point active trackage ends and only abandoned, disused track remains.

The western terminus of the line was Watuppa station at Plymouth Avenue near Front Street.

[1] In 2008, the first section of the Quequechan Rail Trail opened over a portion of the former Fall River Railroad right-of-way along the shore of South Watuppa Pond east of Brayton Avenue at a cost of $462,000.

State funding was awarded in 2022 for a 550 feet (170 m) extension east to the Westport town line.