The Main Line is an unofficial historical and socio-cultural region of suburban Philadelphia,Pennsylvania, along the former Main Line of the Pennsylvania Railroad, which runs northwest from downtown Philadelphia parallel to Lancaster Avenue (US Route 30).
The railroad connected the Main Line towns in the 19th century. They became home to sprawlingcountry estates belonging to Philadelphia's wealthiest families, and over the decades became a bastion of "old money". Today, the Main Line includes some of the wealthiest communities in the country, including Lower Merion Township, Radnor Township, Gladwyne, and Villanova.
Rail service is provided by Amtrak's Keystone Corridor and SEPTA's Paoli/Thorndale Line.