SEPTA's 25 Hz traction power system

The Southeastern Pennsylvania Transportation Authority (SEPTA) operates a 25-hertz traction power system in the vicinity of Philadelphia. The system, which SEPTA inherited from the Reading Company, is similar to but electrically separate from the 25-hertz system built by the Pennsylvania Railroad (PRR) and now operated by Amtrak. SEPTA's trains can run over both because the voltage and frequency presented to the locomotive are essentially identical.

SEPTA owns all of the former Reading substations. It also owns several substations that are electrically part of Amtrak's 25-Hz system, including former PRR substations along the Media/Wawa Line and the Chestnut Hill West Line, and a newer substation just north of 30th Street Station.

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