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Retarder control (Dctr)

Computer viruses ()
Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Train operation (Dct)
             Use For: Train handling
             Related Term (Associative): Pilotage and driving (Dcnbs); Train crews (Mtgr)
            Locomotive operation (Dctm)
            Retarder control (Dctr)