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Wayside signals (Dcmtrysw)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Control system applications (Dcm)
            Traffic control (Dcmt)
                 Related Term (Associative): Traffic (Bt)
                Railroad traffic control (Dcmtr)
                    Railroad traffic control devices (Dcmtry)
                        Railroad signals (Dcmtrys)
                            Cab signals (Dcmtrysc)
                            Wayside signals (Dcmtrysw)