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Railroad trains (Qbf)

Vehicles and equipment (Q)
    Vehicles (Qb)
         Related Term (Associative): ; 
        Ground vehicles (Qbd)
             Use For: Land vehicles
        Railroad trains (Qbf)
             Use For: Trains
             Related Term (Associative): 
            Freight trains (Qbff)
            Passenger trains (Qbfh)
            Multiple unit trains (Qbfj)
                 Use For: Trainsets
            Train components (Qbfm)
            Trains by motive power (Qbfp)
            Streetcars (Qbft)
            Special trains (Qbfx)
        Ships (Qbh)
             Use For: Vessels; Watercraft
             Related Term (Associative): Naval architecture (Ttkt)
        Aircraft (Qbk)
             Related Term (Associative): Aeronautical engineering (Ttkbb)
        Spacecraft (Qbn)
             Related Term (Associative): Commercial space transportation (Aeas)
        Amphibious vehicles (Qbq)
        Used cars (Qbu)
             Use For: Pre-owned cars; Pre-owned vehicles; Used vehicles