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Railroad tracks (Pmud)

Facilities (P)
     Use For: Complexes; Installations
    Transportation, hydraulic and utility facilities (Pm)
        Railroad facilities (Pmu)
             Related Term (Associative): Railroad tunnels (Pdvtrr); Railroad bridges (Pdybmur)
            Contact wire (Pmuc)
                 Use For: Trolley wire
                 Related Term (Associative): Transmission lines (Pmptm)
            Railroad tracks (Pmud)
                 Use For: Tracks
                Types of track (Pmudb)
                Lines of track (Pmude)
                Track components (Pmudk)
            Railroad grade crossings (Pmuj)
                 Use For: Grade crossings; Highway rail intersections; Highway railroad grade crossings; Level crossings
                 Related Term (Associative): Interchanges and intersections (Pmrcpj); Light rail transit grade crossings (Pmuyc)
            Railroad buildings (Pmur)
            Railroad yards (Pmut)
            Rail transit facilities (Pmuy)
                 Use For: Rapid transit facilities