The SouthEastern Pennsylvania Transit Authority operates trolley, light rail, bus and commuter rail in Philadelphia, Pennsylvania.

SEPTA is a quasi-public state agency that serves 3.8 million people in five counties in the region. It is the fifth largest transit system in the United States.

The Subway–Surface lines are remnants of the far more extensive streetcar system once operated by the Philadelphia Transportation Company. They were converted to a modern light rail operation with trains operating underground through the city centre. The system is comparable to Boston's Green Line and San Francisco's Muni Metro, which uses longer, articulated LRT vehicles.

In October 2006, Penn's class of 1956 funded the construction of an innovative portal for one of the eastbound entrances of the 37th and Spruce Street Station: a replica of a Peter Witt trolley.

Operated by the Philadelphia Transportation Company until 1956, these trolleys brought university students to the campus and to Centre City, Philadelphia. Routes 11, 34 and 37 ran through the Penn campus on Woodland Avenue and Locust Street for nearly 65 years.

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

This is the Locust Walkway, as seen in winter.