M (SEPTA Metro)

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The M, formerly known as the Norristown High Speed Line (NHSL), is a 13.4-mile (21.6 km) light metro line in the SEPTA Metro network, running between the 69th Street Transit Center in Upper Darby and the Norristown Transit Center in Norristown, Pennsylvania. Service is operated by the Suburban Transit Division of the Southeastern Pennsylvania Transportation Authority. Originally the Philadelphia and Western Railroad line, the line runs entirely on its own right-of-way. In spring 2025, the M had an average weekday ridership of 5,108. The M is unique in its combination of transportation technologies. 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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