Blog. A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today. Definition and synonyms of vow from the online English dictionary from Macmillan Publishers Limited.
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.
The Broad Street Line is one of only two rapid transit lines in the United States outside of New York City to use separate local and express tracks for a significant length, the other being Chicago's North Side Main Line from Armitage north, used by Purple Line express trains.