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Meaning of trailer car

trail'er car"

Pronunciation: [key]
— Railroads. Railroads.
  1. a second flatcar used for transporting an object or objects of excessive weight or length.
  2. a passenger car, not self-propelled, included in a train of self-propelled cars.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.