WASHINGTON, June 29 -- The U.S. Department of Transportation's Surface Transportation Board issued the following decision (Docket No. AB 290) entitled "Norfolk Southern Railway Co. - Abandonment Exemption - In the City of Greensboro, N.C.": * * * Digest:/1 The Board clarifies its regulatory authority over a railbanked line in North Carolina and explains the Board's procedures for determining whether a portion of a right-of-way can be removed from such a line. The Board provides the railroad an  more