SEPTA acquired PSTC and assumed operations of the Red Arrow Lines in January 1970.

The now extinct trolley line led to the development of the first planned communities in Haverford Township, namely the streetcar suburbs of Llanerch, Brookline, and Oakmont.

[3] The route begins at a loop around Suburban Square shopping center in Ardmore, then heads west along Montgomery Avenue.

A short distance later, it turns left at Woodside Road, crossing under the Paoli/Thorndale Line near Ardmore (SEPTA station), which also serves Amtrak's Keystone Service.

Shortly after the split between Lancaster Avenue and County Line Roads, Route 103 makes a turn onto a private Ardmore Busway, also known as Hathaway Lane, where it immediately encounters County Line Road station, which is little more than a shed.

The private busway was originally right-of way for the trolley rails until it was paved over, which is why some of the old P&W/Red Arrow Line sheds still remain intact.

Both the busway and West Hathaway Lane go under the Norristown High Speed Line at Ardmore Junction station.

From there, the bus heads east and makes a right turn onto Earlington Road as it runs south again through Penfield.

On January 29, 1970 the route was purchased by SEPTA and the gates continued to be used until being left in the up position and eventually removed.

A mural of a trolley station was painted on a building on the corner where this right-of-way used to exist and was also the site of the Battle of Llanerch which was a physical and legal confrontation between trackworkers from the PRR and the West Chester Rail Company.