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Today, the Main Line is another name for the western suburbs of Philadelphia along Lancaster Avenue (U.S. Route 30) and the former Pennsylvania Railroad Main Line, extending from the city limits to, traditionally, Bryn Mawr and ultimately Paoli, an area of about 200 square miles (520 km 2).n the 20th century, many of these families moved to the Main Line suburbs. Part of the national trend of suburbanization, this drove rapid investment, prosperity, and growth that turned the area into greater Philadelphia's most affluent and fashionable region.