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Railroad materials (Rbmumttr)

Materials (R)
    Classes of materials (Rb)
        Building materials (Rbm)
             Use For: Construction materials
             Related Term (Associative): Equipment (Qt)
            Materials by end use (Rbmu)
                Industrial materials (Rbmum)
                    Materials in specific industries (Rbmumt)
                        Transportation materials (Rbmumtt)
                            Aerospace materials (Rbmumttb)
                            Road materials (Rbmumtth)
                                 Use For: Highway materials; Roadbuilding materials
                            Railroad materials (Rbmumttr)
                                Rail fasteners (Rbmumttrf)