#railroad_car__car__railcar__railway_car__railwaycar  a wheeled vehicle adapted to the rails of railroad; "three cars had jumped the rails"
  supertype:  wheeled_vehicle  a vehicle that moves on wheels and usually has a container for transporting things or people
  part:  suspension_system
  member of:  railroad_train
  subtype:  baggage_car__baggagecar__luggage_van__luggagevan  a railway car where passengers' bags are carried
  subtype:  cabin_car__cabincar  a car for use of the train crew; usually the last car on the train
  subtype:  club_car__lounge_car  railroad car having a bar and tables and lounge chairs
  subtype:  freight_car__freightcar  a railway car that carries freight
     subtype:  boxcar  a freight car with roof and sliding doors in the sides
        subtype:  stockcar  boxcar with latticed sides; for transporting livestock
     subtype:  cattle_car  a freight car for transporting cattle
     subtype:  coal_car  freight car with fixed sides and no roof; for transporting coal
     subtype:  flatcar__flat  freight car without permanent sides or roof
     subtype:  gondola_car__gondolacar__gondola  a low flat-bottomed freight car with fixed sides but no roof
     subtype:  refrigerator_car  a freight car that is equipped with refrigeration system
     subtype:  tank_car__tank  a freight car that transports liquids or gases in bulk
  subtype:  handcar  a small railroad car propelled by hand or by a small motor
  subtype:  mail_car  a railway car in which mail is transported and sorted
  subtype:  passenger_car__passengercar__coach__carriage  a railcar where passengers ride
     subtype:  dining_car__diner__dining_compartment__buffet_car  a passenger car where food is served in transit
     subtype:  nonsmoking_car__nonsmoker  a passenger car for passengers who want to avoid tobacco smoke
     subtype:  parlor_car__parlour_car__parlourcar__drawing-room_car__palace_car__chair_car__chaircar  a passenger car for day travel; you pay extra fare for individual chairs
     subtype:  Pullman_car__Pullman  luxurious passenger car; for day or night travel
     subtype:  sleeping_car__sleeper__wagon-lit__wagonlit  a passenger car that has berths for sleeping
     subtype:  smoking_car__smokingcar__smoker__smoking_carriage__smokingcarriage__smoking_compartment__smokingcompartment  a passenger car for passengers who wish to smoke
  subtype:  slip_coach__slip_carriage  (British) a railway car at the end of the train; it can be detached without stopping the train
  subtype:  tender  car attached to a locomotive to carry fuel and water

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