 It began as a streetcar line in 1902, operated by the Ardmore and Llanerch Street Railway, then the Philadelphia Suburban Transportation Company (PSTC, doing business as "Red Arrow Lines") until converted bus operation to December 1966.SEPTA acquired PSTC and assumed operations of the Red Arrow Lines in January 1970.The route begins at a loop around Suburban Square shopping center in Ardmore, then heads west along Montgomery Avenue.