| (subclass FreightCar RollingStock) | Transportation.kif 2139-2139 | Freight car is a subclass of rolling stock |
| (subclass Boxcar FreightCar) | Transportation.kif 2144-2144 | Boxcar is a subclass of freight car |
| (subclass FiveWellStackCar FreightCar) | Transportation.kif 2172-2172 | Five well stack car is a subclass of freight car |
| (subclass Flatcar FreightCar) | Transportation.kif 2176-2176 | Flatcar is a subclass of freight car |
| (subclass HydraCushionFreightCar FreightCar) | Transportation.kif 2190-2190 | Hydra cushion freight car is a subclass of freight car |
| (subclass OpenTopRailcar FreightCar) | Transportation.kif 2199-2199 | Open top railcar is a subclass of freight car |
| (subclass TankCar FreightCar) | Transportation.kif 2232-2232 | Tank car is a subclass of freight car |
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