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Freight trains (Qbff)

Computer viruses ()
Vehicles and equipment (Q)
    Vehicles (Qb)
         Related Term (Associative): Computer viruses (); Computer viruses ()
        Railroad trains (Qbf)
             Use For: Trains
             Related Term (Associative): Computer viruses ()
            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)