flatcar

[flat-kahr]
noun
a railroad car consisting of a platform without sides or top.

Origin:
1860–65, Americanism; flat1 + car1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The flatcar construction consists of a stiff underframe and a bulkhead sheet
  making up the end structure.
Each unit must be secured on a flatcar so that it cannot permanently change
  position during transit.
Containers that can be stacked one atop another on a flatcar.
Two boxcars, a flatcar, a gondola and two switcher locomotives have received
  reports.
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