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Railroad traffic control (Dcmtr)

Computer viruses ()
Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Control system applications (Dcm)
            Traffic control (Dcmt)
                 Related Term (Associative): Traffic (Bt)
                Air traffic control (Dcmtb)
                     Use For: Air traffic control systems; Air traffic management
                Highway traffic control (Dcmth)
                     Use For: Street traffic control; Traffic management (Traffic control); Vehicular traffic control
                     Related Term (Associative): Computer viruses (); Highway operations (Bqd); Motor vehicle operations (Brd); Traffic engineering (Ttkfwt)
                Railroad traffic control (Dcmtr)
                    Grade crossing protection systems (Dcmtrg)
                    Railroad signaling (Dcmtrs)
                    Railroad traffic control devices (Dcmtry)
                Vessel traffic control (Dcmtv)
                     Use For: Vessel traffic services