Service is operated by the Suburban Transit Division of the Southeastern Pennsylvania Transportation Authority (SEPTA).

The 101 and 102 run together on their exclusive right-of-way in Upper Darby to Drexel Hill Junction for approximately 2 miles (3.2 km), at which point they diverge.Route 101 continues on its own right-of-way traveling west and southwest through Drexel Hill and Springfield with an important stop at the Springfield Mall before entering the street in Media.

After Aldan, it returns to its own right-of-way, then passes through Collingdale before terminating at Chester Pike in Sharon Hill.

Route 102 stops at Springfield Road in Clifton Heights, then runs within this street until it moves onto Woodlawn Avenue through Aldan.

The Sharon Hill Line (Route 102) was originally built by the Philadelphia and West Chester Traction Company, and opened on March 15, 1906, and the Media Line (Route 101) was originally built by the same company, opening on April 1, 1913.

[12][11] After a period of public comment, SEPTA revised its plans to primarily refer to the line as the "D," as well as to rethink the name of the Route 101's "Orange Street" terminal station name.

[13] In 2023, SEPTA awarded Alstom Transportation the contract to furbish 130 new low-floor trolleys, with an option for 30 more.

Despite being located in the town, there is no direct connection to the Media station of the Media/Wawa Line which is a mile to the south on Orange Street and partly through a wooded area.