Walnut Street is a stop along SEPTA's Media-Sharon Hill Trolley Lines in Upper Darby, Pennsylvania. It is officially located at Garrett Road & Walnut Street, but Bywood Avenue is also included. The station serves both Routes 101 and 102, and only local service is provided on both lines. The station contains two platforms with plexiglass bus-type shelters on both sides of the tracks, both of which are at the far end of each platform.
Trolleys arriving at this station travel between 69th Street Terminal further east in Upper Darby and either Orange Street in Media, Pennsylvania for the Route 101 line, or Sharon Hill, Pennsylvania for the Route 102 line. Both lines run parallel to Garrett Road and Bywood Avenue, and Walnut Street is the easternmost stop where the lines run parallel to both streets. The station is located south of the Upper Darby Township Municipal Library.