The Philadelphia trolleybus system, or trackless trolley system as it is known by its operator, forms part of the public transportation network serving Philadelphia, in the state of Pennsylvania, United States. It opened on October 14, 1923, and is now the secondlongestlived trolleybus system in the world. One of only five such systems currently operating in the U.S., it presently comprises three lines, and is operated by the Southeastern Pennsylvania Transportation Authority (SEPTA), with a fleet of 38 trolleybuses. The three surviving routes serve North and Northeast Philadelphia and connect with SEPTA's Market–Frankford rapid transit line.
~Wikipedia

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