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 cars are similar to those on the Media–Sharon Hill Line 100 series, SEPTA's suburban trolley routes, which were delivered around the same time.

Connections are available to SEPTA Regional Rail, many Amtrak services, and New Jersey Transit's Atlantic City Line.

[10] All five trolleys can be diverted onto auxiliary surface tracks west of the 40th Street Portal when tunnels are closed due to maintenance, an accident, or some other obstruction.

The subway–surface lines are remnants of the far more extensive streetcar system that developed in Philadelphia after the arrival of electric trolleys in 1892.

The PRT funneled the West Philadelphia lines into subway tunnels as they approached the city center.

After the PRT declared bankruptcy in 1939, it was reopened as the Philadelphia Transportation Company (PTC), which was absorbed into SEPTA in 1968.

[12] In October 2006, University of Pennsylvania's class of 1956 funded the construction of an innovative portal for one of the eastbound entrances of the 37th Street station: a replica of a Peter Witt trolley of the kind manufactured by J. G. Brill and Company from 1923 to 1926.

Operated by the Philadelphia Transportation Company, these trolleys brought university students to the campus and to Center City until 1956.

In 1956, the trolley route was buried to enable the university to unify its campus, with Woodland Avenue and Locust Street becoming pedestrian walkways.

[15][16] The entire subway–surface network is run using Kawasaki Series 9000 light rail vehicles, nicknamed "K-cars".

These K-cars are the only modern unidirectional streetcars in the United States, featuring a single cab and doors on the right side only.

[18] Vehicles include air conditioning, large windows, door-opening sensors for the rear doors, and an automated system to display and announce upcoming stops.

[19] In 2023, SEPTA awarded Alstom Transportation a $714.2 million contract to furbish 130 new low-floor trolleys,[20] with an option for 30 more.