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Railroad bridges (Pdybmur)

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Facilities (P)
     Use For: Complexes; Installations
    Specialized facilities (Pd)
        Bridges and culverts (Pdy)
             Related Term (Associative): Highway facilities (Pmr)
            Bridges (Pdyb)
                Types of bridges (Pdybm)
                    Types of bridges by use (Pdybmu)
                        Historic bridges (Pdybmuf)
                             Related Term (Associative): History (TCH)
                        Highway bridges (Pdybmuh)
                             Use For: Elevated highways
                        Military bridges (Pdybmum)
                        Footbridges (Pdybmup)
                             Use For: Foot bridges; Pedestrian bridges
                             Related Term (Associative): Walkways (Pmrtpw)
                        Railroad bridges (Pdybmur)
                             Use For: Elevated railroads
                             Related Term (Associative): Railroad facilities (Pmu)
                            Elevated guideways (Pdybmurt)
                                 Use For: Elevated mass transit