Norfolk Southern is no longer sorting manifest railcars and building blocks of cars by destination at its yard in Roanoke, Va., because it is uneconomical, the railroad announced last week. The volume of general merchandise cars there has declined by about 30 percent since 2006, and the geographical location and layout of the Roanoke yard made it expensive to operate and redundant within the NS network, the railroad said. The Roanoke Terminal will continue t...