01328nam 2200361 450 991070513840332120140306095750.0(CKB)5470000002447974(OCoLC)871537972(EXLCZ)99547000000244797420140306d2013 ua 0engurmn|||||||||rdacontentrdamediardacarrierPositive train control additional authorities could benefit implementation : report to the Chairman, Committee on Commerce, Science, and Transportation, U.S. Senate[Washington, D.C.] :United States Government Accountability Office,2013.1 online resource (ii, 42 pages) color illustrationsTitle from title screen (viewed Dec. 23, 2013)."August 2013.""GAO-13-720."Includes bibliographical references.Positive train control RailroadsAutomatic train controlUnited StatesRailroadsAutomatic train controlUnited States.Congress.Senate.Committee on Commerce, Science, and Transportation,GPOGPOBOOK9910705138403321Positive train control2883461UNINA