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trailer car

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noun 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.
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Origin of trailer car

An Americanism dating back to 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018