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Railroad tunnels (Pdvtrr)

Facilities (P)
     Use For: Complexes; Installations
    Specialized facilities (Pd)
        Underground structures (Pdv)
             Use For: Subsurface structures; Underground facilities
             Related Term (Associative): Pipelines (Pmnp); Underground utility lines (Pmptmu); Highway facilities (Pmr)
            Tunnels (Pdvt)
                 Related Term (Associative): 
                Tunnels by use (Pdvtr)
                    Pedestrian tunnels (Pdvtrn)
                    Pressure tunnels (Pdvtrp)
                    Railroad tunnels (Pdvtrr)
                         Related Term (Associative): Railroad facilities (Pmu)
                        Subways (Pdvtrrs)
                             Use For: Underground railways
                             Related Term (Associative): 
                    Vehicular tunnels (Pdvtrv)