SEPTA Regional Rail's West Trenton Line parallels the line from Neshaminy Falls, Pennsylvania to Ewing, New Jersey, they shared the tracks until 2015 when CSX built a bypass at West Trenton station. SEPTA's Fox Chase Line parallels the line from Newtown Junction to Cheltenham Township, having used it until 2005 when single-track service on the SEPTA line eliminated the need for usage of the freight track.
