The Norristown High Speed Line is a 13.4-mile (21.6 km) interurban light rapid transit line operated by SEPTA, running between the 69th Street Transportation Center in Upper Darby and the Norristown Transportation Center in Norristown, Pennsylvania, United States. The rail line runs entirely on its own right-of-way, inherited from the original Philadelphia and Western Railroad line (still referred to by locals as the "old P&W" or as Route 100). Originally chartered as a Class I (steam) railroad, the line is fully grade separated, collects power from a third rail, and has high-level platforms common to rapid transit systems or commuter rail systems such as New York City's Long Island Rail Road and Metro-North Railroad, but has onboard fare collection, mostly single-car operation, and frequent stops more common to light rail systems.
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