Trolley service was originally anticipated to return in late 2021. As of January 2020, the full line is being substituted by a bus bridge to allow for rolling stock maintenance, track repairs, and a nearby highway expansion. Trolleys terminated at Frankford and Delaware Avenues (Northern Liberties Loop) while buses terminated at Girard Station under the Market-Frankford Line. On April 29, 2012, the east of Frankford Ave the line started being operated by buses due to major reconstruction west of Frankford is still run by PCC II. On September 4, 2005, trolley service was restored. Service was ' bustituted' in 1992, along with Route 23 (Germantown Avenue-11th and 12th Streets) and Route 56 (Torresdale-Erie Avenues). The line was first opened in 1859 as a horse car line operated by the Richmond and Schuylkill River Passenger Railway, and electrified in 1895, with extensions in 19. SEPTA PCC II vehicles are used on the line.

As of 2007, it is the only surface trolley line in the City Transit Division that is not part of the Subway–Surface Trolley Lines (although it is designated as such on SEPTA's rail maps). Route 15, the Girard Avenue Line, is a trolley line operated by the Southeastern Pennsylvania Transportation Authority (SEPTA) along Girard Avenue through North and West Philadelphia, Pennsylvania, United States.