SEPTA subway–surface trolley lines

The SEPTA subway–surface trolley lines are a collection of five SEPTA trolley lines that operate on street-level tracks in West Philadelphia and Delaware County, Pennsylvania, and also underneath Market Street in Philadelphia's Center City. The lines, Routes 10, 11, 13, 34, and 36, collectively operate on about 39.6 miles (63.7 km) of route.

SEPTA's Route 15, the Girard Avenue Line, is another streetcar line that is designated green on route maps but is not part of the subway–surface system.

Like Boston's Green Line and San Francisco's Muni Metro, the SEPTA trolley line is the descendant of a pre-World War II streetcar system. It also shares many similarities with the premetro and stadtbahn systems of continental Europe. Where Boston and San Francisco's systems use longer, articulated LRT vehicles, Philadelphia uses rigid vehicles roughly 4 feet (1,219 mm) longer than the PCC streetcar they replaced. The lines use Kawasaki Type K LRVs delivered in 1981–82. The cars are similar to those on Routes 101 and 102 100 series, SEPTA's suburban trolley routes, which were delivered around the same time. However, the subway–surface cars are single-ended and use trolley poles, while the suburban lines use double ended cars and pantographs for power collection.

Recently, SEPTA signed a contract with ALSTOM for 130 new low floor streetcars to be delivered. These cars are scheduled to be delivered from 2027 through 2030.