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trailer car

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.
Origin
1885-1890
1885-90, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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