SEPTA Routes 101 and 102 (also known as the Media–Sharon Hill Line or the D1 and D2)[4][5] are light rail lines operated by the Suburban Transit Division of the Southeastern Pennsylvania Transportation Authority, serving portions of Delaware County. The route's eastern terminus is 69th Street Transportation Center in Upper Darby Township, Pennsylvania. Route 101 runs to Media, while Route 102 goes to Sharon Hill. Altogether, the two lines operate on approximately 11.9 miles (19.2 km) of route.[6] The lines are one of the few remaining interurban systems in the United States, along with the South Shore Line in Illinois and Indiana, the River Line in New Jersey, and the Norristown High Speed Line, also in the Philadelphia area.
Along with the Norristown High-Speed Line, formerly the Philadelphia and Western Railroad, the routes are the remaining lines of the Red Arrow Lines Trolley System once operated by the Philadelphia Suburban Transportation Company (successor to the Philadelphia and West Chester Traction Company); some local residents still call them "Red Arrow".
This route uses 29 Kawasaki Heavy Industries Rolling Stock Company Type K LRV cars similar to those used on the SEPTA subway–surface trolley lines. However, unlike the city cars, the Type K cars on Routes 101 and 102 are double-ended and use pantograph collection instead of trolley poles.
An early city ordinance prescribed that all tracks were to have a gauge of 5' 21⁄4".