sentences:  U.S. Route 30 enters the valley around Malvern and serves as the main thoroughfare in the valley as far west as Coatesville, where Pennsylvania Route 372 becomes the main road along the valley to its western end.The Great Valley is also served by Amtrak's Keystone Service and SEPTA's Paoli/Thorndale Line rail service for much of its length.This Great Valley is near and parallel to, but distinct from, the Great Appalachian Valley.